Cyano is not totally non-photosynthetic as we are led to believe. It receeds at night and is slow to restore to the surface of sand or rock until after the 10k to 6K lights come back on. If you think otherwise, look for the cyano growth about 0500. You'll likely think its gone. Garf has identified a number of animals that eat it and they do a great job if in numbers enough to control it. I got 100 micro blue leg hermits from Reeftopia and they plus a variety pack of snails kept the 125 clean all the time even though I feed a group of tangs and butterflies very well in there. A good refugium takes care of the export. No matter what advice is taken, cyano is a bother and can grow in all kinds of conditions, lighting and flow. I've had it grow over top of snails and hermits in 30 minutes and kill them. Mattered not what I did to beat it. I finally gave up and let it run its course in my 75 and now its under control with some micro blue legs keeping it in check. Cycles take time to move on into the mature tank phase. Just maintain your sense of humor if you have to deal with cyano like that.

PS: Dragons eat tons of pods. If your system if not full of pods, sell or give the dragonette away before it too dies.

If astreas love the glass more than the rocks, scrape the glass clean, extra clean and then use a magnet scraper on it all the time. Move the astreas to the rocks if they don't move on their own. They will clean that film off the glass that you don't see and stay on the glass so long as you don't keep it perfectly clean. They should loose interest when there is nothing to eat there anymore.