4 is more than enough already.
i have 8 over 32" wide tank about 17" from the light, 8" off the water. they fried almost every sps i have. i have to take 4 out and replace that with MH...
I wish I would asked a similar question before I bought my fixture because now I want a couple more bulbs to add another 1 or 2 actinics. I currently have a 1:1 ratio of aquablues to blue+ and I think it gives a really white look.
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