Thanks guys! The fixture comes with legs to mount it on the tank, and it also comes with a suspension system. If possible, I'd rather not hang it, but I will if I need to. I haven't found a site yet that tells how high the mounting legs are, but the PC lights I have now are made by the same company - the legs raise the fixture 2 1/4 inches above the tank frame.

What do you think about running the new fixture during the tank cycle to see if it gets too hot? Today I bought a digital thermometer/monitor that has low/high temp alarms on it...