I know there must be some former reefers on here that are using metal halides to light their viv's. If so, how are they set up? I have a pair of 250watt lights that I am considering using on a 65 gallon. My main concern is the extra heat added by these lights. If you use a fan to help cool things down, it seems like that would also lower humidity. For those using MH lights, how are you regulating your temps and humidty??