Emerald crab with what look like...mites???

So i just noticed my emerald crab crawling across the rocks with his claws fully extended. Then he climbed to the top of the pile and just sat there with his arms stretched out. When i got close to examine him, i saw lots of very tiny things crawling all over him? Ahat could these be? And what should i do?

 

you could try rinsing him off with saltwater in a seperate bucket, i know land hermits can get mites and the remedy is a bath to kill the mites and sterlize the habitat.
but since there alive in the water the whole tank probably has them, so i dont know if washing would have any effect. and i guessing its not worth sterlizing a whole salt tank for one cleanup member.

if your lucky there just harmless amphipods or baby emeralds.