OK, I should have known better...always check compatibility before adding fish. Here's what I got: Started with 3 ocellaris/percula (not sure which one they are exactly). They were all relatively close in size, but there was definitely a small, med, and larger one among the three. Probably around 2.5 - 3 inches. Then a friend of mine was breaking his tank down and offered me his large Maroon Clown (probably about 4-5 inches). Now this thing immediately took over one whole side of the tank and would not let the ocellaris clowns anywhere near the midpoint in the tank. No big deal really since it's a 110 gallon tank. The ocellaris eventually got the message not to try and cross the midpoint and the maroon clown never bothered them too much. They all coexisted for a year together with no major problems. Then, about 7 months ago my father-in-law decides he's getting rid of his tank. He was gonna just flush his two Clarkii clowns down the toilet so I decided to rescue them. I figured since they were about the same size as the Ocellaris I had it wouldn't be a problem. Well boy was I wrong. The Ocellaris and Clarkii's fought from the get-go and have never stopped. Part of the problem may be they have to share the same side of the tank since neither species can go near the Maroon without getting chased. Anyway, the Clarkii's seem to have won and I am now down to one Ocellaris (the largest one of the three). I have no idea what happened to the other two, they just disappeared. The one that is left hides underneath my liverock all day. If he comes out for even a second the two Clarkii's furiously attack him until he goes back under the rockwork. I'm afraid he's gonna die of starvation soon. Is there anything I can do about this problem? Are Clarkii's always so dominant and abusive to Ocellaris clowns? I actually like the Ocellaris clowns better than the Clarkii's so I thought about getting rid of them, but how? The tank has about 200 lbs of live rock to hide in.