I used two of the 24" PFO parallel reflectors from www.customaquatic.com on my 60" tank . That way it only left a 4" gap in the middle and a 4" gap on each end. Mine is a fully enclosed canopy so the gaps help the air circulation and I drilled 4" holes in top directly over the reflectors so heat gets out but light doesn't hit the ceiling. With a 4" Vantec Stealth computer fan in each end the canopy stays nice and cool.
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