I have seen them eat valonia and just pick away at the rocks. I'll have to look closer. Unfortunately I don't spot them often.
Just spotted another crab, probably of the pain in the ass species. I was wondering why all my frags get knocked over and out pops a brown/red crab with a lot of fuzz on it. Similar looking claws to the emerald. I haven't put any new rock in the tank in years. Its amazing how they sneak in on a small piece of coral.
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