Okay.
If the light fixtuer has the vents in the side... but no fans. Run to your local computer hardware store and but the mini fans. You should find some in with the performance cooling stuff. Might be labled as a VGA fan or something like that.
Install em on one side of the fixture to pull the warm air from the lights.
Works a treat on mine.
Remove the glass top.
Or, remove part of the glass top at the front. Leave the back exposed.
Alternativly, find a clear plastic solution and drill holes all over it.
Turn the heater off entierly (unplug it) and monitor the temps.
Mount some black (or white, or reflective) backing on the back (above the tank), and perhapse on the tank sides. This will stop light spill and reflect more light back into the tank. That simple glossy blue backing works so well and looks nice too. Chances are, your going to have algee all over the back side of that thing soon enough anyway.
Consider perhaps some stepped lighting?.
My whole T5 array doesnt come on all at the same time.
I have the 42" come on first for 1 hour, then the 2 24" come on. Then the reverse at night.
You have a little over 5watt per gallon. Not too shabby.
Okay.
So, sa your tank develops the amount of light that gets reflected and thrown out will go down. As corrals and algee develop, they will absorb the light. As the rock matures, browns and with any luck goes purple, it will stop reflecting as much, and same with the sand (except the purple bit).
What you can do right now is change the time the lights are on. Since you have little live stock, you could set the lights to come on at 6am and go off at 4 or 5pm. As the tank develops and matures, you can tinker with the schedule and bring it towards a more pleasurable viewing range.