High phosphates-using reactor and can't get them down

[Ryanerickson]

He's talking about a carbon source not black charcoal for water clarity. A carbon source will feed bacteria. A example is np pro by aquaforest with this you would be feeding bacteria that will help reduce phosphates and nitrates your bacteria source would be aquaforest pro bio-s. I'm using aquaforest as a example there's many other carbon and bacteria products.