I have a whack load of those in my new tank - they were on the live rock that I got. I don't think they are reefsafe (pointy claws) and I have seen them picking at my coral. I have trapped about 8 of them so far and bet there is another 10 at least in there. I haven't tried trapping in a couple of weeks so this is a good reminder for me to get back at it.
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