I have one male fiddler crab in a newly bought 5.5 gal tank. He's the only thing in there! Everything's cycled and i buy him R/O water from the pet store, and add salt. I switched him from a large plastic storage container to that. He does that signaling thing and waves his claws around, which he didn't do when he was in the plastic tub. Theres about 1.5 gal of water in the tank, with rocks to climb up on. he seems kinda lonely, should i get him a lady crab?
