Hi Ming Han,
Adding weak acids will reduce pH. I'm not sure why anyone would ever want to do this, for plants and fish don't much care what the pH is in normal ranges.
If you have an ammonium/ammonia problem, you can reduce the toxicity by lowering pH, but that is no solution. Solve the ammonium problem by other means.
I guess we need more information to know what you wish to do.
The way a buffer system like carbonate/bicarbonate works is to take up the extra hydrogens from a weak acid to slow the rate at which pH is lowered.
CaCO3 <-> CaHCO2
Wright
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