Abril,
Seems like you and I are in the same boat with cyano, I have been battling it for some time now and it's getting to the point that I hate blowing the rock off with the turkey baster just to get the tank somewhat pleasant to look at.
There are a lot of good treatments that use erythromycin to rid the tank of the nasty bacteria such as chemi-clean. However, one thing that I know for sure is that personally I don't want to treat my tank with an antibiotic to kill this stuff that is just going to come back in 6 months (it’s the whole cliché, “treat the problem not the symptom”)
About 3 weeks ago I went to one of SFVR monthly meeting and they had a guest speaker by the name of Dr. Tim, his expertise is in bacteria. He has many papers written on reef bacteria as well as he also has a line of products for all types of aquariums and ponds. One in particular that I think will help us is he has a schedule of products that a lot of local reefers swear gets rid of cyano bacteria. I remember meeting him before at another gathering and discussed other things but not cyano (it wasn’t a problem for me then). Like I said,many local refers with far more established tanks than I have had great success. Before the meeting, I was able to talk to Dr. Tim and we discussed these products and based on what he said as well as everyone’s testimonials, I am ready to try these products.
The products are Re-Fresh and Waste-Away, it seems that you first use the re-fresh to clear the water using live beneficial bacteria, after that you would use waste-away which also uses live bacteria to remove accumulation of junk that has settled in your tank that the cyano uses to populate the consensus is that in about 4 weeks time the cyano will be completely gone.
I haven’t used the product yet, I was planning on meeting up with him this weekend to get a couple bottles of this stuff and hope to put this chapter behind me. One thing I’m not sure of is if I will have to continue to add waste away in the tank or after the cyano is gone I can stop. If you want I will report back with my results.
Jimmy