Renegade, you will need to do more research. As I understand that phosphates and nitrate will be used up in a certain ratio (just for example 1 phosphates : 5 nitrate). So if your tank does not have nitrate, no phosphates will be consumed by bacteria. That's why people also run phosphate binding media. Same happens, if no phosphates, no nitrate will be consumed. I may be wrong too. Cheers.
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