Well I finished my racks for the lighting yesterday and did a test run. I was happy with how it looks.
All I can say is....PVC pipe is mans best friend (after dogs,) (well after dogs and beer), (well after dogs beers and pizza....but you get the idea).
Basically I made a rack for each light with 3/4 PVC and eggcrate. The reflector is attached to that and the PVC sides straddle the hole in the tank. The sides of the PVC are locked in place using a clippable saddle clip that is zip tied to the tank top (...ahh the beauty of acrylic...easily drillable). The ght is 8 inches above the water.
The lights can be easily removed should I need in the tank.
I will post some pictures later this evening I hope.
Paul.