I used it, and the problem never returned. In my experience Cyano is a problem that occurs more commonly in newer tanks. It seems that whatever it lives on goes away in time. Some people insist that it is phosphates that cause the problem, but there is really no supportable evidence of that.
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Bob
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To be loved you have to be nice to people every day - To be hated you don't have to do squat.
---------Homer Simpson--------
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