I need to adjust my ph down from 8.3 straight out of the tap, to something more suitable for plant growth. I have kept fish for years, and most have adapted to my hard water and high ph. But now that I am branching into aquaponics, I need to reduce it with a product that is safe for fish. This is a 2000 gallon system, so "ph down" at the fish store is cost prohibitive.
What do you guys suggest?