ph crash

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    PH Crash-New Tank

    I have started again on my 200 L tank. I have a new filter (FX4) but retained by old biological media. I am using new tropica soil. I have done 2 * 50% water changes in the last week since it was set up.. It currently only has 6 small corydora on-(refugees from last set up) I am on London Tap...