Should You Feed Cherry Shrimp During a Heatwave?

On the first really hot day, you might walk past the tank in the evening and find it’s warmer than it was at lunchtime. The room still feels stuffy, the lights have been on for hours, and there’s a little piece of food from the previous feed sitting exactly where you put it. Should you carry on as usual, or give the shrimp a night off?

If the tank is hotter than usual and there’s already food left, hold the next feed while you check the tank. Look at the thermometer, the filter and the way the shrimp are behaving. Once things settle, you can go back to a small, familiar feed and see what they do with it.

Check the tank temperature, not just the forecast

A tank can warm up slowly over the course of a day. A room that feels tolerable in the morning may get a lot warmer when the afternoon sun hits the window. The water may stay warm after the air has started cooling, especially when the room gets little ventilation overnight.

Read a thermometer in the aquarium and make a note of the time. If you have a second thermometer, you can compare it when a reading looks surprising. Check again later in the afternoon and before you go to bed if that’s when the room tends to be warmest. Knowing the pattern makes it easier to judge whether the tank is still warming up or beginning to settle.

Compare the reading with what you usually see in that tank. The cherry shrimp water parameters guide puts temperature alongside ammonia, nitrite and the other tests worth keeping an eye on. A single number is more useful when you know what has changed and how quickly it happened.

Look at surface movement and the shrimp

Warm water holds less dissolved oxygen than cooler water under otherwise similar conditions. Check that the filter is running and that you can see some movement at the surface. If you use an air-driven sponge filter, see whether the flow and bubbles look like they normally do. A quiet tank on a hot afternoon is a good reason to check the equipment before opening the food.

See where the shrimp are. One shrimp climbing a plant or grazing the intake can be entirely ordinary. If many gather near the surface or the filter outflow at once, or the colony suddenly becomes very still, check the temperature, equipment and water quality promptly. Those behaviours can have more than one cause. Use what you can observe and test to decide what needs attention.

If there’s uneaten food you can lift out easily, do that. Work gently around small shrimp and keep the filter running. If an ammonia test gives a reading, use the ammonia action guide for the immediate checks.

Keep any cooling gradual

Look at what’s warming the tank. Close a blind before the sun reaches the glass. If your aquarium lights add heat, shortening the lighting period during the hottest part of the day may help. When the room outside the tank is cooler, better airflow around the tank can help too.

Some keepers use a fan across the surface. If you do, keep it securely mounted away from splashes and follow its instructions. Check that shrimp and other inhabitants can’t escape through an open gap. Evaporation can increase, so keep an eye on the level and follow your usual aquarium-safe top-up practice. Evaporation leaves minerals behind, which is worth remembering if you’re replacing a lot of lost water.

Avoid trying to pull the temperature down suddenly with ice or a large cold water change. Watch how the tank responds to each adjustment, including after the room cools at night. If you do need to change water for a water quality problem, use appropriately prepared water and pay attention to temperature and other differences from the aquarium.

Decide what to do at feeding time

If the shrimp are grazing normally and the aquarium is steady, you may be able to keep feeding a small familiar portion. Put it where you can see it and check it before you leave the tank for the evening. A hot spell is a poor time to try a generous portion of a new food whose leftovers are hard to find.

If you’re seeing unusual behaviour, there’s food left or the tank is still warming, pause the extra food while you check what’s going on. In an established tank, cherry shrimp have grazing surfaces they can use between feeds. A pause in supplementary feeding is easier to manage than another pile of leftovers while you’re dealing with heat and equipment. Very young tanks and unusual setups deserve closer observation rather than a timetable borrowed from somebody else’s aquarium.

For a routine you can adjust as the tank settles, see how often to feed your shrimp. The usual schedule is a starting point. The tank in front of you is what you’re making a decision about today.

Go back to the usual routine a feed at a time

Once the temperature is back around the tank’s usual range and the shrimp are moving and grazing normally, offer a small amount of a familiar food. Check whether they pick at it and what’s left at your usual cleanup time. There’s no need to add the portions you skipped to make up for them.

Before the next hot spell, check that you can see the thermometer without lifting the lid. It helps to have your test kit and a clean container handy as well. Those small preparations make the evening check easier when the room is hot and you’re already busy.

If a heatwave lasts several days, a short note can help. Write down the afternoon temperature, what the shrimp were doing and whether you fed. You may discover the aquarium stays warmest long after sunset or that one particular room heats up faster than the others. Next time the forecast turns hot, you’ll know when to check the tank and which small changes helped it stay steady.