I had 4 T5s over a 55 gallon hex tank and they worked real well. I think with the reflectors, there shouldn't be much "bleeding" of light that is not directed into the tank. It would be hard to build a canopy for a bowfront tank, so the fixture may be your best option. I have no experience with the fixture, but I love the T5 lighting and I also really enjoy the LED moonlights. Sounds and looks like a good choice!