Never heard of a 'killer' pom pom crab. IMO these guys are probably the most reef safe crab.
I have an emerald who eats nothing but algae and is rarely seen during the day, though I can't really speak for his nocturnal habits... I have seen him moving around in the tank at night, but I don't think I've ever seen him near any of the corals.
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Calvin
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Planning a 29 gallon mixed reef...
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