I purchased what I believed to be a l029 called a galaxy or vampire Pleco. Since I have had him, i haven't seen him use his caudal fin. He didn't use it at the fish store either. He just shuffles around with his pectoral fins for food and hiding places. Even if I touch him with my hand, he refuses to use his caudal fin to escape. do any of you know of possible causes of this behavior besides his back being broken? (Please don't be a broken back!)