Help with my emerald crab

[Emarley]

Hello fellow reefers,

Can I get some help/advice regarding my emerald crab.
The lights are now off on my tank for the night and my emerald crab has come out, I’ve noticed he’s got something attached to one of his legs, a limpet? and he’s also got two legs missing. Can I get some help as to what’s happened?
I’ve attached two photos but there taken on my phone with flash so are not the best.

Thanks in advance

Dom

 

[Bret Brinkmann]

Hard to make out what is on its leg. Was it always there? If not and the appearance of this thing coincides with the legs going missing, then I'd say remove the thing from the crab.

 

[Paul Sands]

Emerald crabs can regrow appendages. happens as part of the molt.