I have a 5 gallon set aside for swordtail fry. I want to put something in there but i don't want any fry eaten. I can imagine a snail or clam would be fine, how would a crab or a few shrimp sound? Are there any fish that could be put in or is that a no-no?
Cherry shrimps or snails will do. Crabs will eat the fry. I can't comment on the clams though as I've never kept them. I have golden pencilfish and they never ate the fry(rainbowfish) but I certainly will not recommend golden pencilfish in a 5 gallons tank.
Cherry shrimp should work, ghost/glass shrimp will eat fry, I know from experience so they would be out. Cories wouldn't work because of the tank and believe it or not they will eat their own eggs and fry. I watched them take out a dozen of 3 day old fry of their own when I released them back into the tank from a net breeder. It may have just been the julii (C. Trilineatus) I have but it could happen.
Nerite snails are supposed to be the best algae cleaning snails there is any the best part is they will not breed in fresh water, they need brachish water to breed. I have never seen them but there are places to get them online.
any kind of small snails are fine shrimps/crabs etc will eat fry if they get the chance clams are filter feeders and may eat very tiny fry(danios,tetras)but are good for water quality as they siphon off particles in the water
porcupine snails are good they are small winkle like snails that grow no bigger than pea,red ranshorns are good too
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