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Welcome to TRT! There isn't really too much when it comes to lighting. It really depends on what you want to keep in the tank. Are you planning on sps, lps, softies? Let us know what you are planning. 31" is actually pretty deep, for sps you may not have enough light, unless they are near the top. I've got 6 x 54 in my 75, which is only 20" deep. You have to decide what corals you want, then adjust the amount of time you keep the lights on based on how the corals are doing.
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Don 75 gl bb reef w/ 30 gl sump, Octo NW-200, Tek 6 x 54 T5's - 10gl nano w/ 2 x 20 T5's
There are terrible temptations which it requires strength and courage to yield to.
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