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Floss will add nitrate like a mother. It's kinda like bioballs in many ways, except it's not completely out of the water.
Loose the floss filter, or use it only a few hours per week. I never used a floss filter in my entire life and my water quality is very good.
There are many many causes for nitrates. Mostly are from having a small skimmer and over feeding, even not enough live rocks may be a problem. 3'' sand bed that havn't been vacumed could cause such problems also.
I would suggest you find the problem first, correct it, and change your water. If you're confident in your abilities and your tank, then you can add calcium gluconate (seachem reef calcium)/sugar/high-priced Vodka-please do some research on these methods first before adding anything.
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