Bacteria seems to be the best nutrient control..
And carbon dosing to "supercharge" that bacteria..
After that ATS/macroalgaes seem to be able to process a decent amount..
One will basically never put their finger on the source of Cyano for me is a seasonal thing only coming in the early fall/winter (so right now mine is flaring up)..
Your nitrate levels IMO say that your ATS/Macros could be doing better or are undersized.. Simple liquid carbon dosing (cheap vinegar is all you need) could easily knock them down to nothing in a few weeks or so..
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