I had a flame hawk named "Tony". He was great, loved that fish, then one day he decided to see what it was like on the outside.....I don't think he liked it to well....I found him the next morning and no amount of CPR was going to bring him back. Hopefully your tank is fully covered. Mine had a 2" strip in the back where cords and tubes go in and out, just enough room for Tony to try his fins at flying.