Basically yes... Usually a nitrate spike can bring on cyano, but the lovely thing about cyano is that even if NO3 is brought down to 0, it can hang on and linger forever. Sometimes it needs a real kick in the pants to get rid of it (ie. slime remover or lights out).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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