As for his cruising. Is there anything I can do to keep him from getting sores on the tip of his nose. He rubs so much at the top of the tank that it's in the same spot. I use a teeny little dab of neosporin without painkillers to just keep any bacteria from getting it infected but I'd like to keep it from happening. I check the screen regularly and there's no loose pieces of metal so I know its just from him rubbing at the top. Any way I can keep him from getting the sore?