I bought a crab but I can't ID. Pill-'something' crab?

[Schulks]

I went to my LFS to grab some crabs for my tanks because bubble algae is appearing. I got an emerald crab and another crab the employee couldn't remember its name but he said they are good/better than the emerald crabs. He said the name sounded like pill-'something'-crab. It is much bigger than the emeralds with a thick body but thinner pinchers.

I released him into the aquarium and he instantly buried himself so I can't get a good picture but I'll get one soon.

Does this ring a bell for anyone?

 

[Schulks]

I dug him out for a quick shot. No idea why it is so blue I turned whites up but lmk if a better pic is needed.

 

[MoshJosh]

Pitho crab

 

[Schulks]

Pitho crab

Thank you very much!