We got a Coral Banded Shrimp as part of a "package" deal from a website. He is VERY territorial & has claimed one corner rock in our 100gal tank as "his". In his little corner is litteraly a graveyard of shells, claws, etc. He is NOT that big, and the crabs he's eating (Porcelain, Emarld, and a mystery crab with bright purple claws that we did not put in the tank!) are bigger than he is. But all the "parts" are in his little lair area, so I'm assuming he's eating things in the tank..
but so far, so good with our other shrimp & the CBS