I would like to see the results of this test you should get some good before and after pics. I am building a new canopy now and would like to finish it sometime soon with 6 T5HO's and 2 MH's.... I was going to put 2 4" fans on it, it will be interesting to see what happens. Might have to go with 3. What do you have for fans/cooling on your tank now and what type of fixture is it?
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