I don't know what is in Algone, but I am using it in my heavily planted tank that is only 3 1/2 weeks old. I put some Algone in after the first week, when I began to see some algae forming. I have not had any trouble with water quality. For almost two weeks I have been testing every day or two, no ammonia...no nitrite and only low level nitrate on one test. My new tank has not had any trouble with cycling. I think it is a good product. The only way I would buy it is through their website....much cheaper than at the LFS I saw it at today! I am going to continue using it. I don't enjoy scraping algae and like looking at it even less !! Go to their website and have a look....