Generally, you do not need to add baking soda unless you have water without buffering capacity <eg RO/DI water, or naturally soft water with no KH.> In those cases, using carbonates (crushed coral/limestone) to buffer your water is more foolproof.
If you post your pH AND KH, we can figure what you need to do.
Generally, you do not need to add baking soda unless you have water without buffering capacity <eg RO/DI water, or naturally soft water with no KH.> In those cases, using carbonates (crushed coral/limestone) to buffer your water is more foolproof.
If you post your pH AND KH, we can figure what you need to do.