I was debating adding small fish to my 10 gal or even shrimps...good thing I didnt Moonie is always nipping my snails...I added them from my QT tank last night, poor things...I think theyve either learned to keep their feelers in or hes bitten them off :( I have no doubt theyll be fine, but I do feel bad about them getting picked on. Based on this behavior id say its safe to say shrimp and small fish may have lasted 5 minutes. He always seems so laid back but I guess I was wrong. Kinda slightly bummed that I cant expand my tank mates but oh well, what a silly fish!