I was wondering what types of canopies every had. I have an oak one the sits off tank 6 inches. I have been having problems with heat. I can't close top because temp jumps up. I have put a small fan onto the top but I lose alot of water and I don't know if it's a bad thing to have to top off. I was thinking of bringing the height of the top up another 6 inches so there would be air movement but don't know what a 12 in top would look like..