Planted Tank Guru
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But the bacteria use the carbon from the carbonates. With the KH testing zero, that is what I would add. Carbonates (or bicarbonates). Add what is known to be missing.
I was assuming that well water contained adequate carbon content either in the form of CO2 or organic matter. The softener would be removing calcium therefore replacing the calcium would be desirable. I recommended calcium chloride because it is stable, dissolves instantly, is easily available, and something she is going to need to replenish with every water change.