Food for thought. We are discussing Cyanobacteria. This is a very broad classification of "blue green" bacteria. We try to group them into one large category, and there is some value in that. Not all of the cyano we encounter will play by the same rules. For instance, I referenced a study in the other thread that the "average" cyano N ratio is 5:1 or less. There are specific cyano strains with very high nitrates. Your experiences my contradict each other but that doesn't mean either is wrong. It could just be different strains of the same bacteria family.