I have three T5s and one NO over my 70. They are about 4" above the water. My temp goes from 79 at night to 82 during the day. I keep the room at about 78. The canopy is enclosed except for a 3 inch slot along the bottom of the backside. I just installed two T5 reflectors last night (finally...what a difference in brightness), I'm curious to see if this bumps the temp up any. I have an Orion fan on order (been meaning to do that for a long time too).

What T5 bulbs are you running Josh? I'm thinking about trying one of the blue plus lamps.