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I have a 15g high tank. I have had two ocellaris clowns which have been in the tank for two weeks. They are the only fish in the tank so far. They seem to be doing fine. One clown is slightly larger than the other. They swim together often. At times, the larger one seem to try and nip the smaller one. Afterwards, the smaller one makes this stange twitching motion with its body. This afternoon, I actually saw the larger clown grab the smaller one by the tail fin and would not let go. They both we going in circles for few seconds before the larger one let go. I looked at the tail fin of the smaller and it wasn't torn at all. Is this behavior, the twitching and grabing of the tail fin normal? Is this agressive behavior? Funny thing is, when the lights go out I find both of them "sleeping" together (in a vertical position) by the heater. Any thoughts?
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