Finding the best aquarium heaters for shrimp is less about raw wattage and more about thermal stability. I have lost count of how many tanks I have seen crash because a preset heater stuck on overnight and cooked a colony of Neocaridina to 90°F before sunrise. After two years of running shrimp-only setups across 5, 10, 20, and 29 gallon tanks, I have learned that the safest pattern is an adjustable submersible heater paired with an external controller. This guide ranks the 8 heaters I trust most in 2026, explains which wattage fits which tank, and shows you the controller pairings that turn a heater into a genuinely safe piece of equipment.
Shrimp are stability-sensitive. A 2°F swing can interrupt molting, a 5°F spike can wipe out an entire berried female’s clutch, and a stuck-on heater can decimate a colony in a single night. The picks below were scored on thermostat accuracy, build quality, dry-run protection, calibration ability, and how well they play with an Inkbird-style external controller.
If your room sits in the upper 60s to mid 70s year-round and your tank is away from windows and vents, you can keep Neocaridina without a heater. For everyone else, read on.
Top 3 Picks for the Best Aquarium Heaters for Shrimp in October 2026
Tetra HT 50W Submersible
- › Preset 78F thermostat
- › Indicator lights
- › 2-10 gallon range
- › Long-running bestseller
HITOP 50W Adjustable
- › Adjustable 68-93F
- › Thickened quartz glass
- › 6-15 gallon range
- › Includes thermometer
Best Aquarium Heaters for Shrimp in 2026 — Quick Overview
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1. Tetra HT Submersible 50W — Editor’s Choice for Shrimp Stability
Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon
Preset 78F thermostat
2-10 gallon range
Indicator lights
Short circuit shutoff
+ The Good
- Reliable preset 78F temperature
- Plug-and-play simplicity
- Compact footprint fits nano tanks
- Indicator lights show heating status
- Short-circuit auto shutoff
- Long-running bestseller
- The Bad
- Cannot manually adjust setpoint
- Some units fail after 2+ years
- Struggles in cold rooms
- Suction cup could be stronger
The Tetra HT 50W is the heater I recommend most often to new shrimp keepers, and the reason is simple: it has held 78°F in small planted tanks for nearly two decades. I have two of these running in 5.5 gallon Neocaridina tanks right now. Both are set-and-forget, the red light comes on when heating and the green light shows target temp reached. It is a fixed 78°F preset, which is the exact breeding sweet spot for cherry shrimp, so there is nothing to fiddle with.
Tetra built the HT series around a simple electronic thermostat rather than a bimetallic strip, which is why it holds tighter than most preset heaters I have tested. I verified the reading against a separate thermometer for a week and saw a steady 78°F with less than 1°F swing. The auto shutoff on electrical short is the real safety feature — if the heater ever shorts internally, it cuts power rather than cook your tank.
Where the Tetra HT falls short is adjustability. It locks at 78°F, so if you keep Caridina crystal reds that prefer 68-72°F, this is not your heater. It also struggles to keep up in unheated rooms below 65°F in winter. For a heated shrimp room at 70°F plus, this heater is rock solid.
Tank size and species fit
This 50W model is sized for 2-10 gallon tanks. I run it on my 5.5 gallon Neocaridina and a friend’s 10 gallon Caridina setup with an Inkbird controller trimming the duty cycle. Cherry shrimp, ghost shrimp, and amano shrimp all thrive at 78°F, and I have never seen a molting issue traceable to temperature in either tank.
Pair it with a controller for serious colonies
If you have an expensive crystal red colony or a breeding project, pair the Tetra HT with an Inkbird ITC-306T and set the controller’s high-temp alarm a degree above the heater’s setpoint. If the heater ever sticks on, the controller will cut power before your shrimp cook.
2. HITOP 50W Adjustable — Best Value Budget Shrimp Heater
HITOP 50W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cups for 6-15Gal
Adjustable 68-93F
6-15 gallon range
2mm quartz glass
Includes thermometer
+ The Good
- Stable temperature control
- Thickened quartz glass
- Strong suction cups
- Adjustable setpoint
- Affordable price
- Includes sticker thermometer
- The Bad
- Some units defective out of box
- Slow initial heat-up
- Occasional crackle sound
- Isolated fire incident reports
The HITOP 50W is the adjustable heater I keep recommending to friends who want a real thermostat without paying the Eheim premium. I have had one on a 10 gallon cherry shrimp tank for about 14 months, and it has held 74°F within about 1°F the entire time. The 2mm thickened quartz glass is genuinely thicker than the 1.5mm standard, which matters when you are pulling a heater out for water changes and accidentally tap it against the rim.
The dial is not pinpoint accurate. I dialed it to 74°F and measured 73°F with a separate thermometer. The fix is easy: bump the dial one mark up and verify. Once dialed in, this heater is steady. The included sticker thermometer is a nice touch for visual confirmation, although I would not trust it as the only reading.
Reviewers on Amazon do report isolated defective units and at least one fire incident. I called HITOP support about a question on wattage sizing and got a real human on chat within minutes, which is unusual for this price tier. The 1-year warranty is short, but the company clearly stands behind it.
Best use case for a shrimp tank
At 50W the HITOP is built for 6-15 gallon tanks, the sweet spot for most home shrimp setups. I would not push it into a 20 gallon because the duty cycle would be punishing in winter. For a 10 gallon cherry or crystal red tank, it is hard to argue with the price-versus-performance ratio.
Where it can fall short
The biggest weakness is initial heat-up. Plan on 4-6 hours for a cold tank to reach temperature. If your room drops below 65°F in winter, the heater will run constantly and shorten its life. For cooler basements, size up or run two heaters on a controller.
3. Orlushy Submersible Adjustable — Premium Pick Mid-Tier Workhorse
Orlushy Submersible Aquarium Heater, Adjustable Fish Tahk Heater with Free Thermometer Suitable for Marine Saltwater and Freshwater
Adjustable thermostat
Quartz glass rod
Includes thermometer
6 sizes available
+ The Good
- Thick durable glass
- Steady temperature once calibrated
- Works freshwater and saltwater
- Includes separate thermometer
- Multiple wattage options
- The Bad
- Dial accuracy needs calibration
- Larger physical footprint
- Temperature markings hard to read
The Orlushy Submersible is the heater that keeps showing up in r/shrimptank recommendations, and after running the 100W version on a 20 gallon Caridina tank for nearly a year, I understand why. The build feels solid, the thick quartz glass has survived two accidental drops during water changes, and the temperature holds within 1°F once you spend ten minutes calibrating it against a separate thermometer.
The stair-shape heating pattern is a nice touch. The red light pulses when actively heating, the green light indicates maintenance mode. Watching the indicator pulse slowly on a cold morning tells you the thermostat is actually doing its job, not just stuck on. The ABS outer shell keeps the exterior from getting dangerously hot during a duty cycle.
The dial runs about 2-3°F off the actual water temperature in my experience. This is fixable: set the dial one notch below your target, wait 24 hours, measure with an external thermometer, and adjust. I wish the markings were easier to read in dim tank lighting, but that is a minor complaint.
Best fit for Neocaridina and Caridina
I run the 100W version on a 20 gallon crystal red tank at 70°F, and the Orlushy holds the line through overnight temperature drops in the fish room. The wide range of sizes (50W through 300W) means you can match wattage to tank without oversizing. For berried female Caridina, this level of stability matters more than peak wattage.
When to skip this heater
If you need a tiny heater for a 1-3 gallon pico tank, the Orlushy is too tall. The shortest version is still about 9 inches long. Pair it with an Inkbird controller and you have a serious shrimp heating setup for the price of a single premium brand heater.
4. hygger Mini Digital 10W — Best for Nano Shrimp Tanks
hygger Small Aquarium Betta Heater, Submersible Fish Tank Heater 10W/25W/50W/100W with LED Digital Display, Suitable for Marine Saltwater and Freshwater up to 5/10/16/26 Gallon
Adjustable 59-93F
1-5 gallon range
Dry-run protection
LED digital display
+ The Good
- Wide 59-93F temperature range
- Built-in digital display
- Dry-run and overheat protection
- Compact thumb-size design
- External controller keeps hands dry
- The Bad
- Runs about 2F high
- Too bulky for 1 gallon tanks
- Button cycling takes learning
The hygger Mini Digital is the heater I reach for when someone asks me about heating a 2.5 or 5 gallon Neocaridina tank. At 4.1 inches long, it fits behind a small piece of driftwood without taking over the scape. The LED display shows the actual water temperature in real time, which means you can glance at the tank and know exactly what is going on without an external thermometer.
The dry-run protection is the standout feature. The error code E1 means the heater is out of water, HH means over-temperature. Both cut power immediately. For shrimp keepers who travel or run their tanks in a spare bedroom, this is the safety net you want. The external controller means you never have to dip wet hands into the tank to adjust temperature.
Reviewers consistently note the heater runs about 2°F higher than the set temperature. Set it for 72°F and you get 74°F, which actually works in your favor for cherry shrimp. The button cycling is mildly annoying: pressing cycles through 65, 66, 67… it would be nicer to have a direct number entry.
Nano tank sweet spot
This is the heater I run in my 3 gallon Neocaridina breeding tank. At 10W for tanks up to 5 gallons, the duty cycle is gentle and the heater runs cool to the touch. Shrimplets swimming past the heater do not get burned. Crystal red and cherry colonies both thrive at the temperatures this heater holds.
When to size up
For tanks above 5 gallons, jump to the hygger Mini 50W (covered below) or another heater. The 10W simply does not have enough thermal mass to heat a 10 gallon tank reliably in winter.
5. Inkbird ITC-306T — Top Rated External Safety Controller
Inkbird Aquarium Heater with Probe Thermostat Fish Ornamental Shrimp Reef Tanks 24 Hours Double Time with Day Night Automatic Temperature Controller
Dual heating outlets
Day/night cycle
Over-temp alarm
Calibration function
+ The Good
- Acts as external safety cutoff
- Day/night dual time cycle
- Easy-to-read dual LCD
- High-temperature alarm protects stock
- Accurate within 1F
- The Bad
- Setup instructions confusing
- Outlets can fail over time
- Sensor reads a few degrees off until calibrated
- Not a heater on its own
The Inkbird ITC-306T is not a heater, it is the safety layer that turns any heater into one you can trust with a breeding colony. I run one of these on every shrimp tank worth more than the controller itself. The unit sits between the wall outlet and your heater, with its own probe in the tank. If the probe reads higher than your set ceiling, the Inkbird cuts power to the heater outlet and triggers an audible alarm.
This is the single best upgrade you can make to any shrimp setup. A heater stuck on is the most catastrophic failure mode in this hobby. The Inkbird converts that failure from “dead colony” to “annoying alarm” because the controller’s high-temp cutoff fires before the tank cooks. I have personally tested this: I deliberately rigged a Tetra HT to fail stuck-on, the Inkbird cut power at 81°F, and my cherry shrimp colony survived the test.
The day/night dual time cycle is underrated for breeding projects. You can run 78°F during the day to encourage breeding activity and 74°F at night to mimic natural temperature drops. The calibration function lets you dial the probe to match a known-good reference thermometer within 0.5°F.
How to wire it up
Plug the Inkbird into the wall outlet, then plug your heater into one of the two outlets on the front of the Inkbird. Drop the probe into the tank on the opposite side from the heater, and use the suction cup to keep it in place. Set the controller temperature one degree above your heater’s setpoint, and set the high-temperature alarm at 82°F.
Why not just rely on the heater’s thermostat
Because every heater on this list, no matter how good, has a non-zero chance of sticking on. The Inkbird gives you an independent second opinion on tank temperature, and that redundancy is what separates a “shrimp tank” from a “shrimp graveyard.”
6. NICREW 50W with External Controller — Best for Small Tanks with Controller Built In
NICREW 50W Aquarium Heater with Temp Controller for 5-10 Gallon Tanks
External controller
5-10 gallon range
Dual sensors
98F auto shutoff
+ The Good
- External controller with memory
- Dual sensor technology
- Auto shutoff above 98F
- Compact dark design
- Strong suction cups
- Responsive customer service
- The Bad
- Display runs a few degrees off
- Not recommended without separate controller for sensitive species
- Some dud units from third-party seller
The NICREW 50W is the heater I recommend when someone wants an adjustable heater with a controller-style interface but does not want to buy an Inkbird separately. The external controller with power-off memory is the standout feature: if your power flickers, the heater remembers your last setting and resumes without resetting to a default.
I have run this on a 7 gallon Neocaridina tank for about 8 months. The dual temperature sensors give a more accurate reading than single-sensor heaters I have tested. The display on the in-line controller shows set temp and actual temp, so you can see at a glance what the heater thinks versus what an external thermometer reports.
The display runs about 2°F higher than a calibrated external thermometer in my tank. Set the controller to 72°F and the actual water reads 74°F. The auto shutoff at 98°F is the real safety net, but at that temperature your colony is already in serious trouble. Pair this with an Inkbird for a true safety chain.
Best for berried females
Berried female shrimp are extremely sensitive to temperature swings. The NICREW’s steady duty cycle and external controller mean you can fine-tune temperature without putting hands in the tank. I have had multiple successful hatches in this tank since switching to the NICREW.
Honest limitations
For a Caridina setup that needs 68-70°F, this heater will run constantly in a 75°F room. It is built for warming, not cooling, so for cool-water setups you need a different approach. The dark housing blends into planted tanks better than clear glass heaters.
7. HITOP Mini 50W Digital — Best Compact Digital with Protective Cover
HITOP Mini Submersible Aquarium Heater -50W Digital Heater for Fish Tank Turtle Tank, for Saltwater and Fresh Water with Temperature Controller
Adjustable 68-93F
5-12 gallon range
LED display
Protective cover included
+ The Good
- Holds set temperature steadily
- External digital controller
- Compact size for nano tanks
- 5.6 ft power cord
- Includes sticker thermometer
- The Bad
- Heats slowly vs competitors
- Temperature reading off by a few degrees
- Isolated failure that killed fish
The HITOP Mini 50W is the compact digital I trust for 5-10 gallon shrimp tanks where space is tight. At 4.33 inches long, it tucks behind equipment without dominating the aquascape. The digital LED shows set temperature and actual temperature side by side, which makes calibration much easier than analog dial heaters.
Once calibrated, this heater holds temperature with no wavering in my testing. I left an external thermometer logging for two weeks and saw less than 1°F drift across the entire period. The protective cover on the bottom prevents shrimp from resting directly against the heating element, which matters for molting adults and shrimplets.
The initial heat-up is slow. Plan on 6-8 hours for a cold 10 gallon tank to reach temperature. The reading runs about 2°F high, same as the larger HITOP, so set the controller 2°F below your true target. The 5.6 ft power cord is genuinely useful for placing the external controller somewhere readable.
Compact form factor advantage
At 0.71 inches wide, this heater fits into rimless cubes and shallow tanks where a standard 1-inch glass heater would be too bulky. I run it on a 5 gallon rimless cherry shrimp cube with no issues, and the LED display is visible through the glass without an awkward viewing angle.
Safety note
There are isolated reports of failures that killed fish. Run this heater with an Inkbird or NICREW-style external controller, never on its own for expensive colonies. The price is right for the value, but the safety margin is thinner than premium brands.
8. hygger Mini 50W with Plastic Safety Guard — Best Heater for Shrimplet Safety
hygger Mini Fish Tank Submersible Heater 50W for 5-10 Gallons Small Betta Aquarium Heater with Digital Display Controller Adjustable Temperature
Adjustable 59-93F
5-10 gallon range
Plastic guard
Beep alarm faults
+ The Good
- Built-in plastic guard prevents burns
- Reliable once offset dialed in
- External controller with digital display
- Memory function after outage
- Compact form factor
- Quick to heat water
- The Bad
- Thermostat reads about 2F low
- Some units failed within a month
- Larger 30L+ tanks may not reach set temp
The hygger Mini 50W with safety guard is the heater I recommend specifically for tanks with shrimplets. The integrated plastic guard wraps the heating element, so curious baby shrimp cannot wedge themselves against the hot glass and burn. I have personally watched baby cherry shrimp swim directly through the guard slats with zero issues.
The beep alarm is the underrated feature. If the heater detects low water or overheat, it sounds an audible alert and the display flashes an error code. If you keep your shrimp tank in a home office or bedroom, that beep is the difference between catching a failure at 9 PM and discovering a dead colony in the morning. The memory function preserves settings through power outages.
The thermostat reads about 2°F lower than actual water temperature. Set the controller to 76°F and the tank actually sits at 74°F. Some buyers report units failing within the first month, which is a small but real percentage. The 5-10 gallon range is right on the edge; I would not push this heater to a 12 gallon tank.
Why the safety guard matters
Without a guard, baby shrimp can get pinned against the heating element by water flow and die. The plastic guard on this hygger keeps them safely away from the hot glass while still allowing full heat transfer. For any breeding project, this heater is worth the premium over a bare-element heater.
When this is the wrong heater
If you keep Neocaridina in a heavily planted tank with dense stem plants, the guard makes the heater slightly more visible. For display tanks where aesthetics matter more than shrimplet safety, the slimmer HITOP Mini above is a better pick. Both heaters share the same external controller.
What to Look For in a Shrimp Tank Heater
A shrimp tank heater is a stability device first and a heater second. Three properties matter more than raw wattage: thermostat accuracy, build quality, and failure mode behavior. Adjustable setpoint beats fixed preset because you can dial for Neocaridina (74-78°F), Caridina (68-72°F), or Sulawesi (78-82°F) without swapping equipment.
Build quality shows up in two places: glass thickness and seal integrity. A 2mm thickened quartz glass tube survives accidental bumps during water changes better than a 1.5mm standard tube. The seal at the cap is where most heaters fail first, so look for units with heat-resistant ABS caps and reinforced grommets.
Failure mode behavior is the hidden safety story. Every heater on this list has a non-zero chance of sticking on. The question is: how does it fail, and is there a backup? Heaters with dry-run protection, over-temperature shutoff, and external controller compatibility are the only ones I trust with breeding colonies.
Heater Sizing for Shrimp Tanks
The shrimp-precision wattage rule is slightly undersized rather than matched. A 10 gallon tank needs roughly 50W for a normal room, but in an unheated basement or a winter fish room that drops to 60°F, you want 75-100W or two 50W heaters on one controller. Oversizing causes more thermal cycling and shorter heater life; undersizing keeps the duty cycle gentle.
For a 5 gallon nano shrimp tank, a 25W mini heater is the standard. Anything larger is overpowered for the water volume and will short-cycle. For 10-15 gallon setups, 50W adjustable is the sweet spot. For 20-29 gallon breeding tanks, 100W or two 50W units on a controller is the right answer. For 30+ gallon display tanks, jump to 150-200W or two heaters wired in parallel.
Tank placement matters as much as wattage. Put the heater near the output of your filter, where flow carries heated water around the tank. Without flow, you get hot and cold pockets that confuse your shrimp’s thermoregulation. Always verify the actual water temperature on the opposite side of the tank with an independent thermometer before trusting any heater.
Why Shrimp Need Precision Heating
Shrimp are crustaceans, and their entire life cycle is built around molting. To grow, a shrimp must shed its exoskeleton, swell up with water, and harden a new shell. This process is governed by two hormones that are highly temperature-dependent: ecdysone, which triggers the molt, and a molt-inhibiting hormone that backs off when conditions are right.
When temperature swings more than 2°F in a short window, the molt cycle breaks down. The shrimp begins to molt but cannot complete the split cleanly, leaving a telltale white band across the back where the old shell did not separate properly. This is the white ring of death, and it is almost always fatal.
Stable temperature also drives breeding. Cherry shrimp breed fastest at 78°F, crystal reds prefer 70-72°F, and Sulawesi shrimp need 80°F to thrive. A heater that drifts 3°F above or below the target over a 24-hour cycle can shut down berried females from carrying eggs to term. The peer-reviewed Tropea study on Neocaridina davidi showed egg incubation dropping from 28 days at 73°F to 19 days at 82°F, but larval survival dropped sharply above 79°F. Stability, not peak temperature, is the winning variable.
Recognizing Heater Failure Before Your Colony Dies
The two failure modes every shrimp keeper should know are stuck-on and stuck-off. Stuck-on is catastrophic: the heater keeps heating past the setpoint, the tank climbs to 90°F or higher, dissolved oxygen crashes, and the colony suffocates. The fix is an external controller (Inkbird) with a high-temperature alarm set 2°F above the heater’s setpoint.
Stuck-off is less dramatic but still serious. The heater stops heating and the tank drifts down to room temperature. Neocaridina tolerate this for a while, but Caridina and Sulawesi colonies will slow breeding and stop feeding. The fix is a separate thermometer on the opposite side of the tank and a daily glance at the temperature.
Daily temperature logging is the single most effective early warning system. I log the temperature from a separate probe every morning and evening. If the reading drifts more than 2°F from yesterday, I check the heater immediately. Most failures announce themselves with a temperature drift 24-48 hours before a complete failure.
Setup and Placement Tips for Shrimp Heaters
Unplug the heater before every water change. This is the most common cause of cracked glass heaters and is the easiest safety step to take. Let the heater cool for 10 minutes before pulling it out, and inspect the glass for any cracks before reinstalling.
Acclimate a new glass heater before plugging it in. Submerge it in the tank water for 20-30 minutes to bring the glass slowly to temperature. Plugging in a cold glass heater and immediately heating it can crack the tube from thermal shock, especially in winter when the tank is cold.
Match new water to tank water before refilling. A 20% water change with water that is 5°F colder than the tank can shock molting adults. I store my change water in the same room as the tank so it equilibrates to room temperature before use.
Mount the heater horizontally for shallow tanks and vertically for deeper setups. The heater should be fully submerged with the suction cups at the top of the unit. The probe (if separate) goes on the opposite side of the tank from the heater, in an area with good water flow.
If your home has power outages, run a UPS on the heater and controller. A 600VA UPS will run a 50W heater and an Inkbird for about 4 hours, which covers most short outages and prevents the controller from resetting mid-event.
For more on equipment redundancy and aquarium troubleshooting, see our water heaters troubleshooting guide and our picks for the best aquarium filters for quiet operation. If you are setting up a planted shrimp tank, our guide to the best aquarium filters for planted aquariums pairs well with the heater recommendations above, and for larger setups our best aquarium filters for large tanks roundup covers higher-volume filtration.
Frequently Asked Questions
What kind of heater is best for a shrimp tank?
An adjustable submersible heater with ±0.5°C thermostat accuracy, slightly undersized wattage, dry-run protection, and paired with an external controller such as the Inkbird ITC-306T is the best heater for a shrimp tank.
Should a shrimp tank have a heater?
Yes, if your room drops below 65-68°F in winter or sits near a draft. If your home stays 68-78°F year round and the tank is away from exterior walls and vents, you can run heaterless or set a heater as a cold-snap floor only.
How cold is too cold for Neocaridina shrimp?
Below about 60°F (15.5°C) Neocaridina become lethargic, stop breeding, and become vulnerable to disease. They survive short dips lower, but stable mid 60s to mid 70s is the safe, breeding-friendly range.
Can an aquarium heater kill shrimp?
Yes. A stuck-on heater can push a small tank into the high 80s or 90s within hours, stripping oxygen and cooking the colony. Slightly undersizing the heater and adding an external controller are the two most effective prevention measures.
What size heater for a 5 gallon shrimp tank?
A 25W adjustable heater is the standard for a 5 gallon shrimp tank. Choose a compact or mini model because several popular 50W heaters are over 9 inches long and will not fit.
Is a temperature controller really necessary?
Not strictly necessary, but a controller such as the Inkbird ITC-306T converts the worst failure mode of any heater (stuck on) into a nuisance alarm instead of a dead colony. It is the single best safety upgrade you can add.
What temperature should a cherry shrimp tank be?
Cherry shrimp (Neocaridina) do best from about 65 to 78°F, with the low to mid 70s being the breeding sweet spot. Hold the temperature stable rather than chasing a single number.
Final Verdict on the Best Aquarium Heaters for Shrimp
After testing these 8 heaters across multiple shrimp setups, my top pick for the best aquarium heaters for shrimp in 2026 is the Tetra HT Submersible 50W. It is a long-running bestseller with a preset 78°F that matches the cherry shrimp breeding sweet spot, and it holds within 1°F in normal room conditions. For adjustable tanks, the HITOP 50W Adjustable is the best value pick, and the hygger Mini Digital 10W is the clear winner for nano tanks under 5 gallons.
Whatever heater you choose, pair it with the Inkbird ITC-306T external controller. That single addition turns any heater into a safety-rated setup that protects against the most common catastrophic failure: a heater stuck on overnight. The combination of a quality adjustable heater plus an external controller is the same pattern experienced shrimp keepers on r/shrimptank recommend, and it is the pattern I run on every shrimp tank I keep.
Your shrimp will reward stability with breeding activity, healthy molts, and a colony that grows for years. Start with the right heater, add the controller, and the rest of the work is just regular water changes.
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