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Meg Stout posted on the forum topic Natural pH up/down alternatives for aquaponics in the group
Aquaponic Window Farms: 3 years ago · ViewForgot to answer your question ::blush:: Vinegar works as a pH down, but you don’t want to bring the pH down by more than 0.2 at a time for the comfort of the fishes. Also, I expect the fishes will do their own magic to bring the pH down over time. Good thing is goldfish [...]
The thing about pH in aquaponics.. once the system is stable after a few weeks, it finds it’s own balance. You don’t have to mess with it. No one I’ve researched ever mentions it, except how it maintains its own balance point of about 7.