NO, it will not totally eliminate nitrate problems, but it will enhance nitrogen fixation and nitrification, I.E. enhance the processing of ammonium/ammonia to nitrite into nitrate. However, you will still need nutrient export to help out the processing of nitrate into nitrogen gas, which will then be expelled through gas exchange in the sump and top of the tank.
Always go with a deep sand bed, my average is 6" in sump and 3.5" in display.
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