I recently had this problem so I can help you a bit. So my
GH is 6 and you would think that would be enough calcium and magnesium. Well my assumption was right in I did not have enough. My
Ca was 10 and my
Mg was 4. You should be able to get a water report. If as you said you are connected to a water softener then most likely your levels are low. You want to shoot for at least 30ppm
Ca and 10ppm
Mg. I would go a bit higher but you want to be close to the 3:1
Ca/
Mg levels. I use a
GH booster from nilocG. Any product will tell you how much you need to add to get the desired
GH. But yes adding calcium will bring your
GH up. Let me know if you need more details of what to do.