What is the TDS
reading from your ro
? Treating tap water will only remove chlorine, not nitrates, and probably didn't help matters, probably explaining why your system is "exploding" with cyano
is "easy", but a long drawn out battle sometimes. Tell us more about your system, livestock, what kind of filtration, and how much/what you feed.
I would increase water changes, between 20-50% and siphoning out the cyano
with some airline tubing. Increasing flow in the tank will assist with the cyano
, as it likes low flow, but the overall issue is those nitrates.