You shouldn't mix types of clowns; if you want a pair, get 2 percs, or 2 ocellaris, or 2 maroons, or 2 clarkii, etc. Not positive as to why (assuming aggressiveness), but I've heard it over and over and over. (I had originally bought a ocellaris, and then fell in love with maroons... but couldn't mix the 2. Also had thought about a clarkii, but again, was told it would be a mistake, so I didn't. Got my maroon now that the condy nem ate the ocellaris, and the condy is now out of the tank LOL! From what I have learned, clowns can be territorial, and (supposedly) should be one of the last fish you add to the tank. (not sure if thats just directed at maroons or all clowns in general)