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Flourite Black Sand dumping GH and KH

Discussion in 'General Plant Topics' started by jonny_ftm, Feb 11, 2010.

  1. jonny_ftm

    jonny_ftm Guru Class Expert

    Mar 5, 2009
    Likes Received:
    Local Time:
    7:11 AM

    Facing difficulties to lower my GH and KH in my RCS 45L, I made this test:

    I filled half of a drink glass with Seachem Flourite Black Sand. Added RO water (KH 0.6) to fill the glass and stir it. After 3 weeks, I tested:
    KH 5.4
    GH 8

    Just shocked. Is this how my tank would go if I didn't make weekly 50% WC? Seachem insist that their substrate is inert. I had really big doubts seeing how much calcium carbonate it holds, but trusted them.

    I'm very angry as I really targetted a lower KH than my actual 2.4. Also, I hate those swings of making 50% WC with a KH of 0.6 and it always ends in 2.2. I'm not sure my RCS appreciate this, especially the babies.

    So, despite its success, I would never recommend it again

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