My tank stays at around 80 - 82 with a dual stage Ranco temp controller, in a blistering hot summer such as the last. All I have is 1x 10in ( I believe) clip on fan that points right down on the tank. I lose about 1/2in of water a day in my 50gal which has dual 250w MH's over it.. The lights are probably a good 14in off the top of the tank mabe a bit more.
Needless to say, if the lights were much closer it would cook easier. I'd suggest like some others have said, raise the lights. Sounds like your hood is not enclosed, so no need to vent that. but blowing some air across the water will help.. Might want a de-humidifier tho
