Calcium too high

[peseifert]

Hi, live in area known to have very hard water so use 3stage RO/DIunit for water changes. Also have functioning water softener system.
Tank is 160 gal, fish, anemones, softies. Added five frags of frogspawn, placed 4 low. Lighting is 43" MaxspectRazor. Gyre, 30 gal sump, skimmer, Chemipure elite.
1.024, no3 zero, dkh 9.2, calcium 620 (2 different kits - Red Sea, salient), mag 1800(skeptical)
Just did 37 gal water change.
4/5 frogspawn ok but highest one lost all polyps over 36 hours (think placed too high). Other than that, tank stable, no fish losses in years, anemones split periodically.....
Any thoughts on dropping the calcium to more normal range?Assume it needs to be precipitated out. Different salt for water softener system?
Appreciate any ideas.
Thanks

 

[downbeach]

What are you using to measure your SG? Any time I see a high Mg reading like that(if accurate) I get suspicious of the SG, the fact that your Ca is also high adds to that suspicion.

 

[peseifert]

Thanks for that.
Sp. grav 1.024 by instant ocean hydrometer
Getting refractor ether to be more accurate

 

[downbeach]

Make sure to get some 35ppt calibration solution for the refractometer too.

 

[sde1500]

On my previous tank it was fish only, and I used a hygrometer to track salinity, it was always a few points off from what the LFS read on their refractometer. I would get 1.017 or 1.016, they'd read 1.02. So much easier using a refractometer now.

 

[peseifert]

Checked sp. grav. with Milwaukee refract omelet. 1.022 compared to IO hydrometer reading of 1.024
Unfortunately the frogspawn are not liking the high Ca levels and are looking stressed.
Thanks for input