Tiny crabs on acropora?

[Paradox]

I just got this new deep water acro and it had two VERY tiny crabs on it. THey are probably about 2 mm wide. THey just kinda hang out on the acro. Are these pests in any way?

[Jeremy1973]

be best to have a pic, but I can imagine they would be hard to get a pic of. But I know people who have crabs that live in their acro. But, I can't think of what species is best to have.

[Geoff]

most of my larger colonies have them. these are the only crabs i have in the tank. they never leave the colony as far as i have been able to see or find out. i do not know what kind the are. everyone calls them acro crabs. all of mine look a little different. they all seem to have the same basic colour of the acro though. as in i have an almost white table acro and the crab in it is all white with a brown strip across the front of it. the other colonies are darker and the crabs are a darker colour to match. i have seen more than one crab in a colony also.

G~

[Paradox]

Thats interesting. Just wanted to be sure they werent pests. My crabs have a blueish tint and is on a brown acro..Hopefully its the acro that adapts to the crabs color =)

[RWD]

I have a few also. They are a pinkish color and live in two different acros. They never harm them and are fun to watch when it's feeding time. I also have a citron gobie that lives in another acro.