I have a 36 gallon corner tank that is about 28 inchs deep. I was wondering if a 250 W MH would heat the tank up to much if I dont have a chiller or do you think it would be ok.
you mean 46 g right? I don't think they make a 36.. and no a 250 would probably be fine on a 46, just make sure you've got fans running over the tank and the light is a few inches elevated off the waters surface at least.