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Not sure what it is. See if you can trap it with some food and a tall glass. Just lean the glass onto a rock and see if you can catch it to get a better pic. I haven't seen that before...so I'll assume not reef safe.
Could it be a naked decorator crab? I looked up pictures of live aquaria and it looks the same.. I only have a FOWLR for now. so he cant attach anything
I dont know what it is, it came all the way out, its small and i see in its right side it has a claw.. On the left it doesnt.
I need to try to get it out.. I dont want it harming my fish or snails.
Edit: Ok i set up the trap.. Both of my perc clowns are nipping at this thing everytime it exposes its body. Im afraid the crab will go crazy and attack my smallest one, because the smallest one wont leave it alone its swimming over the crab until it comes out