octanejunkie
Aquarium Advice Freak
Are Corydoras pygmaeus safe to bunk with neos in a nano tank?
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I think the truth of the issue is that Oto cats are the only fish that seem to be generally accepted as 100% shrimp safe.
Any given fish MAY be ok, and may not. It often depends on the circumstances.. hiding spots, plants, feeding, etc. Pygmaeus feeds on the bottom, so if it finds a newborn shrimp it probably would eat one. Most fish will. But if you have healthy breeding population of shrimp, minor predation won't harm the overall numbers very much.
If you find you have a fish with a real taste for crustaceans you might have to find it another home though. Observation helps.. a bit of luck never hurts. The smaller the tank you have, the less hiding spaces, so it can make it a bit easier for a fish to find more baby shrimps. Might want to make sure the shrimp are well established with plenty of breeding females having successful broods before adding any fish at all, that way, if some babies do get eaten, won't have much impact.