One of my favorites. We have two and they get along great with all the other fish but occasionally pick at each other. They remind me of little buzz saws with their top fins extended. Often swimming out in the open and always moving. When first introduced, we already had three Clown fish. The med. sized Clown didn't like them and kept chasing the Chromis back into the rocks. After a few weeks we found a new home for the Clown as I liked the Chromis so well. The other two Clowns continue to have no problem with the Chromis and it's been over a year now.