Im a starting up my 35 gal. (24 in.deep) tank that is a hexagon shaped and I only want to put zoas in it. My problem is that the tank has a crappy plastic hood for the flourescent bulb fixtures. I have had a hard time finding a canopy this shape. Can anybody give me a minimum light requirement that would work with the dimensions of the tank. The best thing I have came up with is the hang-on Metal halide bulbs. Again I have no way of doing a retro fit cuz there is no canopy, just the hood that the tank came with? Thanks