Looks more like cyan to me based on the picture. Take a turkey baster (or something similar) and try to blow it off. RHA can cling a little bit but cyano will just blow off. If you blow some off, try to suck a bit up and get a feel for it. Cyano is just slime and, well, it's just slime and disintegrates. I'm dealing with a bit of cyano myself right now but I gotta say, yours is much prettier. Let us know if it is cyano and we can work on getting rid of it.