I'm lucky I have two female convicts, never have to worry about fry. From what I can tell convicts are all bark and no bite. All they do is try to scare the other fish through intimidation, this doesn't work with a worthy adversity. Fry or no fry my oscar would beat down any convict just for sport then take their fry as snacks lol I do admire convicts for their spunk though, they try to boss my leporinus around, but the leporinus just ignores them or chases them. Although entertaining, their constant bullying of other fish becomes an annoyance and for that reason I put them in with the oscars for a taste of their own medicine.