I would like to state that in a 180 I hqd yellow striped and perc clowns for a couple years. Yes the yellows would pick on the others only during feedings after that they went back to there sides of the tank until the following feeding. Right now I have a mated pair of blacker ice clown fish and percs in the same 75 gal tank and they actually host in the same hammer coral together. So yes and can be done with out using the dividers and what nots, now I am not telling to go out and do it with success. I knew the effects that could happen with trying this and succeeded, would I do it again yes I would.