I'll have 2 fans clamped to the back of the tank blowing on the MH.
I did the same thing on my 120 when I had 2 x 250w MH and never needed a chiller. I'm suspecting with more water volume on this tank I also will not have a problem.
I'm just wondering about the bulbs being too close to the water surface.
FYI: We keep our AC at 74.




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