Is it possible to have high phosphates and 0 nitrates? My sand has a heavy rust colored film that won't go away. I do 15% water change each week. I only use RODI water. My ph is 8.2 and nitrates read 0.
It is not only possible but appears to be sort of common. Check the advanced topics board. There's a thread right now about dosing nitrate for just this reason. I'm not endorsing it, just mentioning that others see the same results.
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