Hey lIghty
I had a cyano problem. The one LFS told me to use it. The other said that it is in actual fact a anti biotic (he also gave me some specific medical name for it) He said I could buy it from the chemist for about R30 (instead of R195 I paid for it) He then warned me that you should remember one thing of this product. It is ANTI BIOTIC - thus killing off bio organisms / bacteria. These bacteria are also found in your corals (the stuff that carries oxygen through the animal to be precise)
I thought I'd give it a try, as I don't have much to loose at this stage (tank quite new)
I added it Sunday afternoon. Yesterday the cyano was 60% gone and today I only see thin hair strings, so it's about 90% gone. It seems to work BUT...
...You need to swich off your skimmer, and any other resin based chemicals ie. Rowa Phos, Phosban etc. So this product may leave a certain element of risk to the system.
The prodcut must run 48 hours without the skimmers etc and then you need to do a massive water change. I'm doing that tomorrow. I must agree with mandarinman that it will not rid the cause - only the symptoms. So my plan was to just stop it from spreading, then I will do a 30-40% water change each week for the next few weeks. Again also running my Skimmer, Rowa Phos etc. Remember that cyano thrives in softer water, so first check if your KH is high. Soft corals can opperate in KH of up to 10ppm, so try to achieve that goal (experts please correct me if I'm wrong?) This water is too hard for Cyano to live in, and it will die.
That will be my tactics to get rid of it. If you only cure the symptoms, it will only come back again and again.