Ours is in a 125,(all fish added at same time). He is a nasty little bugger, chasing everyone flaring his mouth (even at us) . But he has never nipped at the other fish. I do think if you had a more delicate fish, it wouldn't be able to handle the R/dottybacks in your face attitude. You could call him "the intimidater". LOL

I have two dottybacks....orchid and some other one...lol.....anyways....they have been perfect fish......they have tons of hiding spots so that might be the key.