Sudden Alk and Calc drop

[tanksoftwiddy]

Hello all,
I have a 120 mixed reef that I have been keeping around 9.0 dkh and 450 calc. I have always struggled to keep pH up but have managed to get it up with kalkwasser and co2 scrubbing. I finally have gotten to the magical 8.3 pH number and suddenly my alk dropped 1.5 dkh in 6 hours and calcium dropped 70 ppm over that time.
I calibrated my trident to make sure that wasn’t doing anything weird, and no issues there.
I guess my question is, could me raising my pH to 8.3 consistently have kickstarted a huge growth spurt for my coral which just ate up my alk and calc and created a huge demand increase?
Running dos pumps and apex, trident etc.

 

[Randy Holmes-Farley Verified Community Expert]

Raising pH increases biological calcification, and also abiotic precipitation. It’s very hard to untangle these.

 

[Uncle99]

Seems like a large flux, I’d first do a manual check.

 

[tanksoftwiddy]

Raising pH increases biological calcification, and also abiotic precipitation. It’s very hard to untangle these.

Right. It’s also a fairly low nutrient tank, so I may need to be running less than 9 anyways.