Just was looking over my rock and I noticed an emerald crab. I thought my triggers and puffer wiped them all out long ago but here one is. What threats come with having them with corals? 
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Emerald crabs are reef safe. I haven’t had any issues with them.
They can knock stuff off from time to time, but reef safe.
They are not reef safe!! If you keep sps! I had 2 eating polyps, i had to set up a video camera to find out who it was but he was caught red handed!! Look them up on r2r or rc, alot of people having the same issue, there good for a while but something turns them into demons!
Good to know
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