I think I might buy a cheap LED setup from ebay to try over my nano. I took down my 90g tank due to moving of which I had 2 250W MH's over it. The tank was on the main floor and never got above 80 degrees even during the summer. No fans just open top. Evaporation was only about a gallon a day. I used a Belize Sun fixture that does a really good job of venting the heat. I see a lot of heat complaints using MH and this seems to be the biggest advantage for some over LED's but I think a well designed MH fixture won't add much heat to the tank either in my experience anyway.
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