I breed Goldstripped Maroon Clowns. They keep an eye on their lair, but, other than that they are quite nice to other fish. Most fish will guard their lairs. The trouble is their range is about what you have in a 29 or 30 gal tank. The whole thing is their lair. I have two, not paired, in a 6 foot long reef with butterflies and small fish. The maroons keep a watch over their own little caves and not much more. Not a problem at all for the other fish or inverts, even at feeding time.