01-01-2012, 02:00 PM
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Yes, we need more info on the lighting. I am going to guess it may be T5, with two tubes. T5 or T8 makes a difference. Then the type of tubes, as others have mentioned; we can get into specifics later when we know the T issue.
On nutrients, many occur naturally in a tank with fish. Waste (from the feeding of the fish) accumulates on the substrate and should be left there to work down into the sand, where bacteria break it down into nutrients. Some nutrients also come in the tap water, during the weekly partial water change. Depending upon all this, and the type of plants you select, and how many fish, a comprehensive liquid plant fertilizer may be advisable. Seachem's Flourish Comprehensive Supplement
is in my view the best, used once weekly.