DUDE
I got used to being over 150 in the winter with no lights just a computer and tank mon thru fri. in the summer i peak at 500. I am running mad 5 250 W MH and 12 T5 actintic four footers. Chiller, relocate it to the outside of the house or put in attic. I have fans taking the air above the tank into the attic when the lights turn on. I need to get them on a temp gauge to know when to turn on and off. also insulate your pipes with foam covers, any where they are running, also as many of your pumps that you can take out of the water and have running externally the better, they dont add the heat to the water.