h2o,
you already have magic soil with gex, you do not need to add anymore additives to your water. It is natural for your PH to drop from start of wc at 7.2->5.8 at the end of the week, depending too on your co2 concentration levels, just make sure your water change is around 20-30% and it should not shock your fishes. I used to do a 50% wc but now realise that a 30% is less stressful for my boraras B. e.g fish frantically swimming up and down the glass, darting left and right etc.
the sera PH minus is to lower PH, not prevents PH swings....
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