I find this hard to believe also, as when I tried this product some time ago,the only real benefit I received was the fact that, when the fine particulate powder was added to the tank, it stuck to a small clump of cyano, causing it to roll into a ball, and after a few days of use, I had no cyano at all. It seemed the fine dust layer caused by this product covered the cyano in the tank,(not very much cyano)and after a time, (less than a week),it was completely cleared up. While I am not saying this product is a cure for film algaes and such, I will say that it seemed to work out this way in my own tank, and do not believe that it could be a contributing factor to an outbreak in yours. There was a thread sometime back about this product, with testing done, photos, etc...I don't know the specifics offhand though. Maybe a search could be done. If I do have another cyano problem in the future, I will begin using this product again and see if I obtain similiar results. Anyone have any similiar situations or ideas?
Joey