fry_forever!
Fish Herder
Had an oto caught in a filter today, a neon caught behind a filter today and various neons/bettas/corys/snails have unpleasant run-ins with filters in the past. I try to block them with mesh but the little creatures always find a way to get hurt. I can't help but blame myself.
Try a filter sponge. Slit a hole in it and slip it on the intake. I don't even have problems with fry. (Unless of course they wedge themselves in between the intake and the sponge, but they have to be pretty small to do that).