Ya a 6" fan is what I am running on my 600. I am also growing under a 250 in another room too. Once you can get your heat problem figured out you will love the 600. Need to keep it at least 1.5 feet from the plants though. I tried 1 foot and light bleached the top of a plant with it. 2 foot probably gives the best spread of light with it though. If your tent has an extra vent hole you could just add an extra exhaust fan to the tent it self and pull air out of the tent. I would have the light isolated from the tent so the air going through your light is not passing through the tent and putting the tent in a vacuum. Keeping the room the tent is in cooler will also help if that is an option. I had to put a cheep AC in my grow room. I think it was $120 but made a huge difference.