Emerald crab or something else?

[Chrysus]

Is this just an Emerald crab that has gone pale, or something I should be worried about? He was not eating the zoas, just sitting on them, but I’m not sure if he’s a hitchhiker? I haven’t seen my Emeralds in a long time but they were much greener than that. I do know that I have at least one tiny gorilla crab.

 

[KJ]

Hard to tell from the pic with no see the claws.

 

[Chrysus]

Sorry, you should be able to see a bit better in this one. I believe he’s missing one though.

 

[KJ]

Sorry, you should be able to see a bit better in this one. I believe he’s missing one though.

Mithrax crab (Emerald crab)

 

[davocean]

Emerald, not sure why but I've had a couple that turned white too.

 

[Chrysus]

Emerald, not sure why but I've had a couple that turned white too.

I haven’t seen him in ages - my theory with our old pistol shrimp was that things that always stay in the dark lose pigment, but that was something I made up with absolutely no backing lol. Not sure what wars he has been fighting either though.