Crab ID?

[Big L.E.E.]

Found this on my new Aussie Elegance coral and having a hard time IDing it.

I''m not sure I can get a better picture. However if it helps the body shape and size is like a backwards tick (the head is in the thick end).

Anyhelp would be appreciated.

L.E.E.

 

[LeslieH]

It's a crab and it might be a gall crab in the family Cryptochiridae. It's hard to tell from the picture. Gall crabs live on corals. Females & sometimes the males live inside cavities (the "galls") which the corals form by growing over the crabs. Usually the crabs feed on mucus & some are thought to farm filamentous algae right around the gall opening.