Yes, cyano is a bacteria for sure. Sorry if I made it sound like an algae. However, I disagree that it's not normal for it to show up, especially on new tanks not using good ro/di water. Almost all new tanks will get it. It just depends to what degree and if you do things to promote it or take proper actions to stop the promotion. If conditions are good it can be the size of a dime for a few days and then simply disappear and never show up again. If it was unnatural for it to appear, then there would be no cyano posts at all from people with new tanks. From what I see, there are lots of these posts out there.
