Tank is 11 months old, handful of fish, decent cuc, skimmer is a nyos 160 runs 24/7, chateo grows 12 hours a night. Currently dosing no3 and po4, as I was unable to get detectable readings naturally. My no3 is 4 and po4 stays around 0.04. Cyano is starting to get out of control, I want to eradicate it without using chemicals, so asking for some advice.