How high should a 400w MH be?
Hey Clinton, I think it's really up to you. I chose 6 inches for mine because that's what I read in books and stuff...to have metal halide lighting at least 6 inches from the water surface. But then there's Eli who runs it only an inch above the water... I thought it was crazy and risky but he's been doing that forever. 15" of depth is not much at all...you'll get a nice punch with your bulb. Does it look asthetically pleasing with it 8 inches above? If it does...go for it. I still want to come by and see your tank sometime.. Call me..
des
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