My experience with clown tangs is that they definitely are difficult to keep for two reasons. 1. Their survivability rate is low. 2. They get brutally aggressive as they mature. Certainly it's not impossible to keep them, but definitely more challenging than most other tangs. My last clown tang I had for two years before I had to surrender it to my LFS. It took out a parrot fish and a clown triggerfish and pretty much stressed out everyone else in my tank. I think he just snapped one day because he was perfectly fine (a "model citizen") for a while. Then he just decided out of the blue that he didn't like certain tank mates anymore.
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