lighting height off tank

[daddy01]

Hi,
Me again, I have a 30X12X21" aquarium with a water height of 17", I have a 24" Coralife 130W light with one 65W Daylight and one 55W daylight and a t5 with 2-Blue actnic 03 flourescents. I have a Frogspawn and Nephlea(/sp) and some fish & LR.
Right now my light sits on tank top of tank with eggcrate but I am getting a lot of salt build up on Acrylic covers.
Question could I raise the light a couple of inches above the top and not affect the light reqirements for mushrooms and softies?
Jim