heey i just got a new marbled cat shark like couple hours ago , and i was looking at him , hes new to the tank , only thing in there other then a chormis , and he has a little red ness at the tail ? is that normal ? like hes still a young shark a couple months old , and it could be just the lighting and im seeing right through him letting me see the blood vessels and stuff . but please help ! i just wanna make sure everything okayy 
