I have a 33 gallon display tank, currently holds two clowns, one slightly larger than the other. (Also a baby Hippo tang and a six line). The two clowns have been in the tank for three months. They did fine, and the smaller one submitted to the slightly larger one. Added the Tang, and he fit right in. Then a couple of weeks ago, the six line. They were doing fine, but then last night the clowns began to challenge each other and eventually turned into outright fighting. It appears the smaller one, who was originally the submissive one, began to be the instigator, and this morning he was relentlessly spearheading into the larger one. I put in an isolation box and put the larger (female I thought) into the box to establish peace and safety. Any idea what's going on, and how to handle? Do clowns re-establish dominance at some point after a few months?