Homer -
Is the canopy open on top at all? It might be advantageous to have a small opening so that rising heat can escape. Maybe even a small DC fan pointed out to suck the heat away from the canopy. Having a way for the heat to escape can make a HUGE difference alone though with regards to heat buildup.
I have a coralife fixture in my 29 gallon open back canopy and the fixture gets HOT. Because of having the open back on the canopy though the heat is able to escape and have very little (if any) affect on the water temperature of my tank.
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