Crab Id Needed

[Panda]

I have a grey crab that I have been trying to get a picture of for quiet some time. After some new additions to the tank I noticed a new green crab with hairy legs. It seemed the new crab went straight for the grey crab as they checked each other out for half an hour. Please have a look at the pics and let me know what type these two are. The grey one is hard to see, off to the left of the green on in the one picture. Hope the pics are clear enough.

Thanks for your time

Marcus

[I found Nemo]

Green one is an emerald crab

[Stasher]

Yes, that green one is a 'Mithrax" or Emerald crab. They are reef safe and eat various algaes.I have 2 and they never come out during the day. I couldn't really get a good look at the grey one, sorry.

[Panda]

Thanks for the Id, I will try and get a better pick of the grey one.