What bubbles break surface, they will either disappear when the pH of the water is low (ie. acidic) or persist, form into bigger bubbles and drift away when the pH is high (ie. alkaline). Observing the bubbles in the aquarium gives an estimate to the pH of the water. Big bubbles imply alkaline water, no bubbles or small bubbles means acidic water.
Frequencies that removes \(O\) from ions/molecules (\(NO^{-}_2 and NO^{-}_3\), \(CO_2\)) tend to make the water acidic. Frequencies that remove \(H\) from ions/molecules (\(NH^{-}_4\) and \(NH_3\)) tend to make the water alkaline. The frequency that breaks up water tends to make it alkaline.
A teaspoon or two of soda will neutralize the water when it is too acidic. Otherwise just play the frequencies to add alkalinity or acidity to balance the pH. Observe the bubbles.
At neutral pH, the bubbles should just break surface, drift away at the same size and disappears. Big growing bubbles means that the water is slightly alkaline.
The correct pH depends on the type of fish in the aquarium. A bubble pH gauge; a happiness gauge for the fish.
