I don't use any buffers, etc. I have drip systems to change my water in most of my tanks (my tank pH is the same as my tap pH). My fish have to adapt or find a new tank to live in. So far, none have requested a new tank.
The natural tendency of an aquarium is for the pH to drop anyway. As the bacteria oxidize the nitrogen products in the tank, the pH gets lowered naturally. If your tap water is well buffered (bicarbonate and carbonate ions) then you won't notice much of an effect. If the buffers are low or if water changes are neglected, then the effect will be more pronounced.
The natural tendency of an aquarium is for the pH to drop anyway. As the bacteria oxidize the nitrogen products in the tank, the pH gets lowered naturally. If your tap water is well buffered (bicarbonate and carbonate ions) then you won't notice much of an effect. If the buffers are low or if water changes are neglected, then the effect will be more pronounced.
