Kole tang gone mental?

Sure is! Mine has been doing it for nearly two years now. It has completely ripped off the tail spines on both sides...see...

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Actually, all my fish do that...attack the side of the tank...usually it's when I haven't scraped off the algae. I think when my foxface and watchman blenny do it, they're trying to shake up the algae on the glass so they can scrape it off. Dunno why my stupid clown does it though ;) Then again, my clown eats algae sheets :shock:
 
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