Yeah you can't turn off a DiY. As long as you have some surface agitation, your pH should be fine if your KH is up around 3 or higher. This means your tank is well buffered and the pH swing is less noticible.

You can also adjust how many bubbles you have by placing your DiY on an air stone and adjusting how deep you place the airstone in the tank. The deeper it is the more pressure on it and you get less bubbles. ;)

There are other secrets/tips to more or less bubble, by how you make the DiY (yeast, sugar, amounts...etc).

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--->Pictures of my 75g Amazon tank<----