I did switch him to a different tank that's a bit smaller. I didn't want to keep him in the Sterilite bin I had him in because I could barely see him, so I got a 3 gallon Pet Keeper. He's been in it for nearly a week, so I don't think that's the problem. None of his decor was sharp, as I already said. I removed it just in case but I don't think it was the problem.
Sequin (m), Shortcake (f), Westley (m), and Sir Righty of Walton (m).