Anyone out there still use Onyx Sand?
Anyone out there still use Onyx Sand? I am setting up a 40 gallon with Onyx sand used over mineralized soil. I will be injecting co2, and the water here in NYC is acidic(I think it comes out of the tap at 6.8.) I guess I am worried that the buffering ability of Onyx will make setting the correct target co2 a pain. Should I be worried?