I have a narrow piece of glass just under my T-5 strip due to bubbles popping and causing splash. I was also affraid of those little slim legs my T-5s sit on would give way or whatnot and cause my lights to take a dip in that nice shimmering water. Of course I don't think my corals/fish would appreciate that zap one bit!
I may have to remove it cause I'm tired of washing it every WC because of the salt residue etc... I'll just grow some balls and remove it!