Noticed something odd about the one fish (of the 3 I have) ... the one seems to be missing the upper lip. I wonder if it was a birth defect I didn't notice right away because they swim around so darn fast. Or maybe one of the other fish picked on it and took a chunk of the fish's face off. Either way, I feel really bad. It seems to be moving about ok, just looks wrong though. I really will be surprised if it lives much longer, as I'm not sure how it could eat under those conditions.
I do have a blind cave fish with a birth defect and have had it 2 years now, it is missing one of it's gill flaps. It's my biggest one (of 4 blind cave fish) and doesn't seem disabled by it at all.
With mass breeding of these fish, I bet a lot of defects come out, as it would with anything bred in mass quantities. Anyone have fish of their own with some sort of defect?