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I can't answer your question because I do not know an ideal ppm to aim for.

Many people with softer water either add dolomite to their substrate, or dose ferts in 3:1-4:1 ratio, as you already know...

For dosing, I seem to recall seeing people taking an "add a little, see what happens, then add some more until the problem goes away" approach.

That's the best input I can give you I'm afraid. Hopefully someone who has a more certain answer will come along to help.
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