dynafire

I tested my water tonight and my Ca and Mg extremely high.

My water param:
Ph: 7
No2-:0ppm
No3-:5ppm (not sure how accurate the API test kit is)
NH3/Nh4+: 0ppm
Po4: 0.5 (nutrafin test kit)
Kh:4
Gh: 7dgh
Ca: 60ppm (API test kit with 3 drop of second bottle)
Mg: 88.43ppm (from calculation)

Is this reasonable? I am also seeing some Ca deficiency symptoms. (deformed leaves on new growth and they are a lot smaller than old growth) I am dosing 5ml of pps pro each day to ~50g of water.

I am planning on doing 50% pure r/o water change tomorrow to reduce the ca and mg level. Will that work?

Thanks in advance,
dynafire