Shrimp tank temperature

The short answer

Shrimp are cold-blooded, so water temperature sets their pace: how fast they eat, molt, breed and use oxygen. A tank that sits comfortably in range and does not swing is far better than one chasing a perfect number.

Ranges by species

These match the figures on our water parameter reference. Neocaridina such as cherry shrimp: about 65 to 78°F. Caridina such as crystal reds and Taiwan bees: about 68 to 74°F. Amano shrimp: about 65 to 80°F. The middle of each range is the safest place to sit. Caridina have the narrowest window, so they are the ones to watch in a warm room.

Why stability matters

Day-to-night swings of a few degrees are normal in a room, but large or fast changes stress shrimp and can trigger failed molts or deaths. Put the tank where the room stays even, away from windows, vents and appliances. If you add a heater, choose an adjustable one and check it against a separate thermometer.

Keeping a tank cool

Warm water holds less oxygen while shrimp need more of it. Keep the tank out of direct sun, add a fan blowing across the surface, increase surface movement from the filter and leave the lid partly open. Cool gradually. Ice or cold water poured in will shock the shrimp more than the heat did.

Water changes and temperature

New water should match the tank. Check it with a thermometer before it goes in and add it slowly; see water changes. The same care applies when you bring shrimp home: float and drip them as described in how to acclimate shrimp.

Neocaridina and Caridina

Neocaridina are the forgiving choice and handle ordinary room temperatures in San Diego. Caridina need the cooler, tighter range and soft water; see Caridina care. If the temperature is a concern and you are unsure, bring a reading and a water sample to the store and we are happy to talk it through.

Questions we get asked

What temperature should a shrimp tank be?

For Neocaridina, roughly 65 to 78 F, with the middle of that range a comfortable target. Caridina such as crystal reds want it cooler and tighter, about 68 to 74 F. Amano shrimp tolerate roughly 65 to 80 F. Steadiness matters more than hitting an exact number.

Do shrimp tanks need a heater?

Often not in San Diego homes, where room temperature is usually within range. A small adjustable heater is worth having if the room gets cold at night or in winter, because swings are harder on shrimp than a slightly cool tank.

Why does warm water make shrimp tanks riskier?

Warm water holds less dissolved oxygen while shrimp use more of it, and bacteria and waste break down faster. Very warm tanks also push shrimp to breed and molt faster, which adds stress. Caridina are the least tolerant of heat.

How do I cool a shrimp tank in summer?

Move the tank away from windows and direct sun, run a fan across the water surface, keep the lid partly open and raise surface movement for more oxygen. Do not drop the temperature quickly with ice or cold water.

How fast can I change the temperature?

Slowly. Aim for no more than a degree or two over several hours, and match new water to the tank when doing water changes.

Keep reading