Why Aren’t My Cherry Shrimp Eating?

You drop in a little food, settle down to watch, and nothing happens. Ten minutes later the wafer is still exactly where you left it. Before reaching for a different packet, have a look at the wood, the moss and the back glass. Are the shrimp ignoring dinner, or have they simply found something else to eat?

Watch the shrimp, then check the food

Look for the little picking movement of their front legs. A shrimp working its way along a leaf or a piece of wood is often grazing on biofilm and other material on the surface. If the colony is moving and grazing as usual, one untouched feed tells you very little on its own.

Watch from a little farther back. If fish or snails get there first, see what happens to the portion before assuming the shrimp turned it down. The community tank feeding guide has more on finding a spot the shrimp can reach.

Think back to the last ordinary day

Did the shrimp only arrive recently? Did you move the feeding spot, rearrange the plants or try a different food? Write down the most recent change. It is easier to judge the next feed when you have one thing to look for.

If the shrimp look active and the water checks out, try a small amount of a familiar food at the next suitable feed. Put it near the cover they already use, somewhere you can see and retrieve it. Give them room to approach. Follow that food’s directions for clearing leftovers, and resist adding a second helping to see whether that gets a reaction.

Test the water if the whole colony seems off

A sudden change across the tank deserves more attention than a quiet feeding spot. If several shrimp have stopped grazing, are unusually still or you are seeing losses, check ammonia, nitrite and temperature promptly. Ammonia and nitrite should be undetectable. Think about any recent water change, new addition or interruption to the filter as well.

If you detect ammonia or nitrite, remove uneaten food, check the filter is running and get advice from an experienced aquatics retailer on the safest way to correct the water. If shrimp are distressed or losses continue, seek help from a vet with aquatic experience. OATA’s freshwater shrimp care guide explains what to monitor.

When a different food is worth trying

Once the shrimp are behaving normally, a small, easy-to-see portion makes a fairer test of a new food. Give it a few ordinary feeding opportunities and watch what gets picked at and what stays behind. A quiet graze is easy to miss if you only look for a crowd.

If you’d like a food you can place and check easily, see how Niblets and Spirulina Complete compare.

Start with a quiet look from the side

Give the tank a few minutes without anyone standing directly in front of it. Then look along the underside of the wood, around the rim of the moss and at the edge of the substrate. If shrimp are picking steadily at those surfaces, the wafer may simply be less interesting than what they’re already finding. A new colony can take time to approach a feeding spot in the open.

Think about what you saw the last time you fed. If they normally rush over and now several shrimp look unusually still or are moving around in an unfamiliar way, test the water. Check the temperature and make sure the filter is running. A change in appetite is something to pay attention to, but there’s more to learn by looking at the whole tank than by assuming the packet has suddenly become the problem.

Find out where the food went

A fragment can slip down through coarse gravel or get pulled into a corner by the filter current. Snails can cover a wafer so completely that you hardly see the food. Fish can carry a piece behind the plants. If the food disappears and you didn’t see any shrimp use it, try a shallow dish or flat stone near cover at the next feed so there’s somewhere obvious to check.

Keep the portion modest and leave a clear view from the glass. Watch long enough to see whether the shrimp approach once the room is quiet. Look again later so you know whether the food is being used or simply sitting there. If it’s left behind, remove the excess as directed. That gives you a fresh start for the next feed.

Think about what changed this week

New shrimp may stay hidden while they settle. An established colony can behave differently after a big plant trim, a rearranged piece of wood or a change in the flow. If you’ve added new fish, watch whether the shrimp can get near the food without crossing a busy part of the tank. If you’re using a new format, check where it sinks and how quickly it softens.

Try to separate the changes. If the feeding place is the new part, put the next small portion nearer the old spot. If the place is familiar and the food is the new part, offer the previous food at a suitable feed and see what happens. Change one thing at a time. You’ll have a better chance of finding out which difference actually mattered.

When water checks come first

Test for ammonia and nitrite if a change affects several shrimp, follows a filter interruption or comes with other unusual behaviour. Both should read zero. Check your usual temperature, and look back at any recent maintenance or replacement water. The water parameters guide explains which tests to run and how to follow up a result.

Once the tank checks out, make the next feed something you can easily follow. Use a familiar portion in a familiar spot. If you can see the shrimp grazing naturally and leaving much of the prepared food, give them longer between feeds or reduce the next portion. The useful question is whether they have access to food and the tank is doing well, even if you don’t see the whole colony at dinner.