I caught one of my large peppered corydoras red mouthed pulling a ramshorn out of its shell. No idea if that happens often or not but when I reset the tank there are lots of snails in view and they disappear once the the fish are back in the tank.
If the corys are not fed, they might eat snails out of nessesity. If you WANT your corys to eat snails, smash em and remove the shell. Corys do like meat yumyum
Another +1 for corys eating crushed snails. When my snail population get's too large, I crush a few and let the corys have at em. However, I have never witnessed mine attempt to eat a snail that had not been crushed, so I believe you should be fine.
I sometimes see my corys scooting around a Trumpet snail or even my Nerite, but i believe that they are just playing with it because it never actually enters their mouths.
I've see a few pull a snail out of the shell, and by all means they weren't hungry. My panda corys will eat Small baby ramshorns at times while the shell is soft enough for them to crush.
It may be a matter of size. Our apple snails are almost big enough to eat our cories. So the cories don't seem to bother them. Not sure about the trumpet snails since I hardly see them anymore.
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