Wow, I hope ours doesn't turn THAT evil! We've only had him a couple months. Noticed last week that we need to put tops on our tank again, as we lost three jumpers since we put the sohal in and I can't help but think that it's related (since we had no jumpers for months and months before then and were running it topless). Most of the time he prefers to stay in one corner of the tank, kind of crazy but gorgeous. Seems to do better now that he has his own nori clip.