I havent heard anything about Bio-Spira used in SW, but of course I have just started. But just about everyone I have talked to on a few differant FW forums that have used it to start a FW tank say that they dont see ammonia show up but they get a huge nitrite spike. I personally wouldnt use it, because youre not exactly elimenating the cycle, you are just cutting part of it out and exposing your entire stock to a nitrite spike.
Mike



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