When I set up my 135 I had the same problems you are having trying to set up dosing cal and alk and mag it for me was a pain so I spent the money and got a calcium reactor and it was easy to set and easy to maintain my levels.
As for your husband not wanting humidity in the house it's actually good for it if you have a lot of woods in it like flooring cabinets if I'm not mistaken 20-40 %
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