Small green crab on SPS.

[CableGuy]

Ideas? Im no crab expert but is it some type of a SPS crab or a small emerald?

[demonclownfish]

i would say at the very least it isnt an acro crab

[XSiVE]

probably an acro crab.. sometimes harmless, sometimes "fun"

[demonclownfish]

arent acro crabs smooth? that one looks a little rough on the shell

[Heidi]

I agree no keeping that hitchhiker, less you put him in the sump.

Heidi

[MizTanks]

Here ya go. Hope this helps
http://www.chucksaddiction.com/hitchcrabs.html

[rosebud161616]

Kind of looks like this guy (Cymo andreossyi):



Hard to tell for sure without a closer picture of yours. What do you think?

[Sir Patrick]

Looks like a small emerald to me, but I am no expert.