Significant Alk Rise and Calc Drop

[reefinginBD]

My tank chemistry got messed up in a matter of 2 days out of no where

Mag: 1130
Alk: 12
No3: 1
Po4: 0.07
Ph: 8.3
Ca: 200

I will do a 40% water change tomorrow

Please give me some tips on what to do to fix this high alk while increasing calc

I was dosing all for reef

I had one of my wall frogs die on me in these two days

 

[Randy Holmes-Farley Verified Community Expert]

I expect the 200 ppm calcium MUST be test error. It cannot drop much in 2 day.

 

[Randy Holmes-Farley Verified Community Expert]

You sure you are not reading the syringe for the calcium kit backwards?

 

[reefinginBD]

Yes I’m sure , it was at 450 when I started and it quickly started to drop much faster than I expected it was last at 340 and during this time I was dosing all for reef

It was keeping the alk at 9 and mag at 1200 while maintaining 350 ish calc but then suddenly in two days the alk shot up and the calc plummeted

I was sick so couldn’t test the water in the last two days

 

[Randy Holmes-Farley Verified Community Expert]

Yes I’m sure , it was at 450 when I started and it quickly started to drop much faster than I expected it was last at 340 and during this time I was dosing all for reef

It was keeping the alk at 9 and mag at 1200 while maintaining 350 ish calc but then suddenly in two days the alk shot up and the calc plummeted

I was sick so couldn’t test the water in the last two days

How fast are you suggesting the calcium dropped from 340 to 200 ppm?

To do so would consume more than 20 dKH of alk, and AFR dosing cannot contribute to that 20 dKH needed. So unless you added a large amount of only alk, it is test error.