Crazy Calcium numbers

[Wagtribe]

I am attempting to add Kalkwasser to my 130 g tank but am frustrated seeing Calcium numbers way too high. I have been dosing Kalk for about 3 months, 200mL via my ATO water and Red Sea dosser. I am also dosing:
Red Sea Reef Energy Plus AB+ - 40mL
Tropic Marin All for Reef - 40mL
Red Sea KH/Foundation B - 6.0mL
I do a gallon per day water change, my salt mix is Red Sea Foundation C - 10.5mL Tropic Marin Bio-actif Salt mix.
The Trident is showing my parameters as acceptable with the exception of my Calcium. It is staying constantly over 500 and no matter what I have tried, (adding more KH and water changes) I still see it going up. What am I missing? I am not supplementing any Calcium to my knowledge. My Corals and fish seem fine, and I have just recently recalibrated the Trident. I also check Calcium using Hanna test and got readings between 511 and 518. What am I missing?

 

[Matt L]

I wouldn't worry about it as long as it is stable.

 

[SPS2020]

As above. As I type, my Ca is at 552 and Mg at 1400. It stays high, but so does Mg so there isn't any precip anywhere.

 

[Randy Holmes-Farley]

400-550 ppm calcium is generally fine, IMO. :)

High alkalinity and pH are the big drivers of precipitation in reef tanks, not so much the calcium levels.

 

[Spare time]

Kalk and all for eef are adding calcium.

 

[Wagtribe]

As above. As I type, my Ca is at 552 and Mg at 1400. It stays high, but so does Mg so there isn't any precip anywhere.

Mag. is the catch...higher KH and Ca are acceptable as long as higher Mg are included? Mag. stop percip.?

 

[Randy Holmes-Farley]

Mag. is the catch...higher KH and Ca are acceptable as long as higher Mg are included? Mag. stop percip.?

I wouldn't push magnesium higher than "normal" for this purpose. It does have that effect, but so do other components of seawater, such as organics and phosphate.

 

[SPS2020]

Magnesium binds to the surface of calcium carbonate which helps precipitating out of the water.

My Mag stayed high when I was using AFR. I switched to two part (they should call it four part :)) and can dial it in a bit better now.