If this is a reef tank, 175w is under-powered for a 30 inch deep tank. Ideal for 175w is 20" & 24" max, unless you're sticking with low to mid-light requiring corals.
I have my lights about 4 to 5 inches above the water line.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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