I am looking to upgrade my lights but have limited space since i have a 72g corner. I am thinking retro fit kit in the canopy with space of 24"x12"? and heat will be an issue?
or maybe
ICECAP pendant 15"x8" // 250W and (10k,14k,20k?)and cutting a hole on the top of the canopy.
If I am not mistaken you should be able to fit a 36" light across the widest point. You just have to finagle leg placement. This would enable you to use a 4 or 6 bar T5.
Say, have you checked at DPA in the consignment section? I think they still have a halide/ACT PC ficture for sale that a member of the club used on her 55 corner tank. It worked great for her. just sitting there looking for a home. fixture, remote ballast and bulbs. plug and play if you think it fits. She had to take down the tank for a move. should be in good shape.