I have been a hobbyist in marine aquariums for 45 years. I have come to the conclusion that cyan is, like so many things existing yet unseen in our aquariums, a lurking background species. Each aquarium has both a unique and universal common mix of viruses, bacteria and other higher micro species. Cyano is omni present and will appear not just because the fundamental needs are met ( organic material and lack of oxygen).It is NOT about poor flow. That is just something that was printed in the 19980s and parroted over and over on the internet. Indeed, it grows best where strong current brings organics to the cyano mat or cyano that clings to dead rock or coral skeleton. Two triggers for when food supply are adequate are 1) a change in lighting and temperature. 2) The food and frequency of feedings you are putting in the aquarium.
