The porcelain crab is a filter feeder mostly, very cool, but since you have percs they will not let it share the anemone. Mine survives, but I think that is only because the percs prefer the sebae and just visit the LTA to chase out the porcelain crab. So he shows his face mostly at night.
Sally's are just awful IME. They'll chase your shrimp if you have them, and kill them when they get large enough. I had a sally jump straight up out of the tank and hit me in the face once..........
Female mithrax is supposed to be okay...I had a male I think. He reminded me of ED 209 in the first Robocop movie. I've heard males eat blue mushrooms like they are potato chips.....
Had a red mud crab once (don't know if that was a red mithrax, it had black on one claw?) We never saw it much until Barry accidentally fed it to the large puffers we had........
Those are my stories
