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Ca and Mg level question

Hi, I just searched the archive for posts on this subject but didn't
quite see my question answered.

I just tested my water with a Hach test kit for total hardness, Ca and Mg
(Mg by differential).

My results were:

Total Hardness: 80 mg/l or 4.46 grains/gallon (this is the same as GH,
Ca: 60 mg/L
Mg: 20 mg/L

Is this a good level and ratio of Ca and Mg?  If not, what is an ideal

Does anyone think I should be experimenting with MgSO4?