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pH does not "bottom out". It only goes so low and healthy fish can adapt well. Water won't turn into battery acid, I promise. Leave it be. There is no need to add a buffer; it won't help and besides, it's too late. I use pure RO with no buffers and inject CO2 (KH - 0, GH - 0). My fish don't complain.

You already said it yourself: "Today (Mon) the fish are showing no signs of distress. My crypts have been melting. My water has no buffering capacity - the kh is very low."

Your plants will melt because they are adapting. They'll grow back if you don't muck around with the parameters too much.
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