Looks like he has fin and tail rot .GET those feeders outa there!!! Use market shrimp silversides , krill , beef heart, SOO much cheaper and no risk of infecting the fish with a parasite.My little rtc was at my lfs on chost shrimp and I brought him home waited 2 days and he ate a chunk of shrimp with no prob.Now when I do my routine with feeding he is like a little excited puppy begging for food.