High calcium usage?

[Ioncewaslegend]

So I've started testing every day to dial in calcium and Alkalinity usage for dosing. I've been testing every day at the same time, and so far my tests indicate my system's using 0.5 dkh and 40 ppm calcium every day.

That calcium usage seems like a lot (especially compared to alk), but I also have coraline algae starting to come in and a lot of LPS. Just wondering if that's normal or a potential issue.

 

[Ron Reefman]

40 ppm of Ca sounds high to me as well. Are you dosing back to your normal level for Ca everyday? And what Ca and alk levels are you trying to maintain? How about Mg as well?

If you don't add any Ca, does the Ca level continue to drop 40 ppm on day 2 and day 3?

 

[Randy Holmes-Farley Verified Community Expert]

I suspect it is test error, unless you are dosing a lot of alkalinity that you did not mention. Calcium cannot decline without removing 2.8 dKH for each 18-20 ppm of calcium.