Water Testing

[Rosco's Reefs]

My new tank is finally up and !probably! starting to cycle. I tested water last night for the first time and all looked good except calcium....

 

Could it have possibly have been 720 mg/L? Also my nitrate tested out at 40 ppm.

 

I will test again tonite at about the same time as yesterday and post the results. thx

[Origami]

This seems unreasonably high. It seems doubtful that such a solution would be stable without precipitation. Even if you mixed up your water using tap water (which has calcium in it that would boost calcium as opposed to RO/DI which would not), I would think that the calcium level would be below 500.