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in my experience they are not good at spotting the fry though once they do stumble open them they will either manage to eat all the fry , only place vulnerable to apisto attack is the eye so maybe damage here to cory
or more likely just worry the parents into eating their own
i have seem whole batches of fry dissappear in a short period , i think this occurs because the cory's either get to close and scatter the babies in parental defence or manage to eat a few , either way the parents must be involved in finishing the fry off to have such quick full fry dissappearance
Mine is a community tank, but based on what I have observed I don't think that a pair of apistos would be able to defend very well against a group of corydoras. As an example feed spriulina discs which both species enjoy. The cacatoides try to chase the cories off of them (especially if a disc ends up near one of their caves) but the cory are relentless and keep returning. I expect that when tasty fry are involved and the corys move in at night, that a pair of of apistos wouldn't stand a chance. Eventually either the corys would get the fry or the parents would become so stressed out that they would consume them themselves. All the reading I have done recommends not keeping corys if your intention is to breed.
They definately won't "attack" the fry, but if they stumble across them they will eat them. I find them good scavengers in breeding tanks, as long as you're pulling the eggs or fry once they're wrigglers.