Chuck's Addiction
Go there and look at Hitch Hikers ..then to Algae section.
It will show you diatom,dino, and Cyano what they look like and stuff.
As for Cyano= BAD. It is one of the oldest forms of life in water. Its pretty amazing species but a pain in our azzes.
You want to siphon out the Cyano when you see it. Just keep it in control. And if a new tank just keep up on water changes and keep your Nitrates and Phosphates down.
Preventative measures for cyano is to keep lots of flow so that the detritus material stays in the water column and gets eaten or skimmed. Also keeping your feeding in check should keep you from adding more to the problem.
Now for those who dont click that link:
Cyano has a silky texture. It can be green to deep maroon colored. YOu will know its cyano when you can wave your hand over it and it sluffs. That stuff will have bubbles appear in its sheets and even have a spaghetti like strands stretching off of the main sheet.
In tanks that are established it is signs your system has a problem. Small outbreaks no biggy...but big ones means something is really wrong.
Seriously keep an eye on that stuff.
Also keep in mind Cyano looks much like Diatoms in early stages...so don't fret yet.
Warning: Do not scrub that cyano ...you will only spread it. And where ever you brush next only puts it in other spots. Siphon it out...the only way. Besides Nuking it ...
Still keep us informed on status. if cyano becomes rampant we will do our best to isolate the root problem.