I have neon's in with my pair and so far they haven't touched them, nor any of the other fish, and I dont have any otto's, the stuff I've read about Krib's indicates that they're quite docile for cichlids, and only get nasty when breeding, but I have to add that I did only get my pair on Friday and they've only been in my tank for about 48 hours, so they're still settling in.