After using anti-red for cyano in my tank, the problem seemed to be solved and i didnt witness any cyano for over almost a month. Now, out of the blue, it comes again strong. I know that i ahve to use RO water, but in the mean time since i cant get a unit right away, do you reccomend dosing again? it seemed to work, and in my lst post about this product, users siad they never had cyano again. Is there something i should be careful about, besides overdosing? TIA for any help/info 