This reminded me of our pet crayfish Pinchy. I found him crossing a road not near any water after a storm and he was missing a claw. We kept him in a plastic tub and did nothing but add water and give him algae wafers for the 5 more years he lived. He grew his claw back and seemed perfectly happy to sit in the same place and not have to search for food for the entire time. Talk about a low maintenance pet!