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Maybe he is curious, or maybe there is algea or some type of organism he is picking at that is next to the coral? Look close, i he upsetting the coral?
No I don't think so I can see him clearly nibbling the coral haha he has a taste of everything that goes into the tank he's knocked over a few small frags think he's just a fatty ?
Throw a sheet of nori in there, typically they herbivores but may resort to coral if veggies aren't available. There is a risk that it just likes the taste of coral though.