One of the keys to Morbert's success is the H. magnifica. If I were you, I'd add a magnifica, or gigantea. This will give the dominant pair a place to live, away from the rest of the group. You probably could have kept the black ocellaris, if they had a natural host positioned away from the colony of BTA's. Another dominant pair will form within the group of clowns and you will have the same problem you had with the black ocellaris.