nitrate and phosphate

[MasterBacon]

I don't know what you mean by food not being a problem (and it may not be an unusually large amount, for sure), but unless you are using tap water, it is the source of both.

You just need more export. There are many good ways.

Chaeto or algae scrubber to out compete the unwanted. What are your lights? T5? Old need replaced? Carbon dosing..... list goes on