Catherine I think if you fix the levels in your change water before doing the actual water change it will slowly bring your tank back into balance. That is what I was trying to get at a few posts ago in my own backarseward way. Do some 30 -40% water changes but before you do make sure that all the levels in the change water are where they should be. Let the change water sit with a power head for a couple of days before you use it and test it again before doing your water change to make sure that nothing has percipitated out.
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