What is your system PH?
I think it is Dino as well but it is a syndrome of accumulation of organic materials that are decomposing in your system. Usually behind and between the rocks, duo to inefficient water circulation and water flow.
One of the symptoms of it is the suppression of PH.
Adding buffer and trying to raise PH with out solving the problem I described will not solve the problem. You have to get rid of the source of the problem!
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