Hmm Calcium is tad high?

[elitesurfer]

I've been testing my water for past few days and my water params are:

Salinity: 1.025
PH: 8.2-8.4
Nitrate: 0
Calcium: 520
Alkalinity: 10-11 dKh

I only have few softie corals/ no fish.
I'm using Ocean Pure Salt Mix. Reef Central's guide does indicate:

OceanPure Calcium:510 Alkalinity:10 Mg:1320

Should I switch to another salt mix? I'm thinking of picking up D-D H2Ocean from J&L.