I am trying to setup a 90 gallon 31" tall tank. I saw a lighting in ebay that you just attached to the edege of the aquarium and it has a hevy duty fan. It comes with 250 metal halide 36" lenght this will fit my 36x18x31 tank. The problem that im having to put that inside the canopy. My canopy has a 9" tall space inside and the back if fully open for heat displacement. Can I use this type of setup? What's your advice?