I dont know why I have not posted this yet. But my tank was getting way to hot with the lights on for more than 6 hours, so I decided to do my "chiller" idea and it works pretty well.
2 of these lower my tank 3 to 4 degrees if put together.
Basically fill a 2 liter bottle of gatorade (or coke) with water and freeze it!
Make sure the water from the inside doesnt leak into the tank. I usually place it in the sump and works pretty well.
Been doing this for 8 months now with no problems.