Not in any way that helps your tank. Cherry shrimp may pick at fish poop, but they feed mainly on biofilm, algae, and detritus, and they will not clear fish waste from an aquarium. Sources disagree on how much poop they actually swallow, but none support using them as a cleanup crew.
Do cherry shrimp eat fish poop?
Mostly no. Cherry shrimp (Neocaridina davidi) are small omnivores, about 1 to 1.5 inches as adults. They spend the day grazing on surfaces, and a shrimp that nibbles at a piece of poop is usually after the bacteria and biofilm growing on it. Many keepers report that shrimp pick at waste, break it into smaller pieces, and leave most of it behind. Fish poop is low in nutrition, and the shrimp produce their own waste as well.
What do cherry shrimp eat in an aquarium?
| Food | Role in their diet |
|---|---|
| Biofilm | Main grazing food, found on plants, rocks, and decor |
| Algae | Regular part of the diet |
| Detritus and decaying plant matter | Regular part of the diet |
| Shrimp pellets, blanched vegetables | Good supplement a few times a week |
| Fish poop | Not a reliable food source |
How do you keep a tank free of fish poop?
Treat poop as a maintenance job, not a job for shrimp. Siphon waste from the substrate with a gravel vacuum, avoid overfeeding, and use a filter sized for your tank. Change about 10-25% of the water on a regular schedule, and add the new water slowly, because shrimp are sensitive to sudden changes.
What to watch for:
- Visible piles of poop mean the tank needs more cleaning or less food, not more shrimp.
- If shrimp get only leftovers, they can go hungry, so feed them a little sinking shrimp food separately.
- Shrimp are more sensitive to ammonia and nitrite than most fish, so don’t add them to a dirty tank.
How to tell shrimp are happy?
Happy cherry shrimp graze openly on surfaces through the day, rush to food, and keep bright, even color. They also molt cleanly: a molt is a clear, translucent shell with a split along the back, so a hollow shell is a good sign. Lethargy, fading color, clustering at the waterline or refusing food point to a water problem, so test ammonia, nitrite and hardness first. A shrimp that turns opaque white may have muscular necrosis, which is usually fatal.