Who Gives A Fish Forums

Another thing to consider is the parents. Sometimes adult Corydoras will eat their own fry if they're stressed or hungry. You might wanna separate the fry into a breeder box or another tank if you haven't already.

I had the same issue last year. Adding more hiding spots like java moss or small caves helped a ton. Fry feel safer with cover. Also, check for any tiny predators like baby shrimp or snails that might be messing with them.