dont know if anyone has mentioned this before but thought id post it anyway. Wolf fish have that tendency to slam there snouts against the sides or top of the tank trying to get out, and i know some have even died doing this. mine was doing it for a couple days on the top of the aquarium, busted his nose up pretty bad. normally i cover the back and sides of all my tanks so i had the idea to cover the glass top with black tank background. and it worked, he has not rammed anything in three days now, he still swims up, looks around but then goes back to the bottom, i think he cant see out, so hes not gonna do it anymore, anyway, just a little tip if your wolves are busting there noses up, just leave the front the only transparent area of your tank