Whaddup guys, im new here to the forum. Anyways, id be really happy if someone could help me out with this guy. I have 76g sand substrate aquarium and he loves to twirls around and dive. But in him doing this, hes sliding across the sand and scraping up his side! Not seriously but noticable. Is this normal behavior? Should i be worried? What can i do?! Thanks to anyone who can help!