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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.
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.
