Multiple Crab Id's Please

[bdhough]

This first one is in my 12 gallon. He's been in there for well over a year now. I haven't noticed anything missing. He only shows his face when I feed and sometimes at night ill catch him wandering around. Im not really worried about him even though he looks like a rock crab but it'd be nice to confirm what he is.

 

[bdhough]

This second one has also been in my 20 gallon tank for at least a year maybe longer. He is strictly nocturnal. I have never seen him out during lights on. He scavenges from what i can tell. This shot is him nabbing the molt of my holloween hermits leg. He likes to leave nice piles of items scattered through the tank. I do know he has taken odds and ends and plugged up holes in one rock. As with the first it'd be nice to know what he is.

 

[bdhough]

bump

 

[bdhough]

He is pretty cool. Doesn't come out except at night though. He's pretty small though. Maybe an inch across.