New tank stopped consume alkalinity

[digitex123]

Hello reefers, im pretty new to this hobby and everything is perfect(i think so) at the moment.
My tank is started about 2 months ago. 15g nano, with protein skimmer. I have some mixed corals you will see on the pic below. I noticed 3 days ago that my system stopped consume alkalinity i check the alkalinity twice a day and its 8.5 dKH. I test with Salifert and tropic Marin kits. Please help me to solve this problem what is the reason and what is the solution.
Here are my parameters:
Temp: 78.8F
Salinity: 1.025
PH: 8.2-8.3
KH: 8.5
NO2: 0
NO3: 20
PO4: 0
Ca: 430
Mg: 1350

 

[A Young Reefer]

its not a problem, it just shows that you are providing your corals with enough alk and that your parameters are stable. do you dose or do water changes?
I would double check the test results.

 

[gbroadbridge]

Hello reefers, im pretty new to this hobby and everything is perfect(i think so) at the moment.
My tank is started about 2 months ago. 15g nano, with protein skimmer. I have some mixed corals you will see on the pic below. I noticed 3 days ago that my system stopped consume alkalinity i check the alkalinity twice a day and its 8.5 dKH. I test with Salifert and tropic Marin kits. Please help me to solve this problem what is the reason and what is the solution.
Here are my parameters:
Temp: 78.8F
Salinity: 1.025
PH: 8.2-8.3
KH: 8.5
NO2: 0
NO3: 20
PO4: 0
Ca: 430
Mg: 1350

I wouldn't expect much Alk consumption at all with the coral pictured, certainly not enough to measure in less than one week.

 

[digitex123]

I wouldn't expect much Alk consumption at all with the coral pictured, certainly not enough to measure in less than one week.

Sorry forgot to mention that my consumption is 0.4-0.6/per 24h

 

[Randy Holmes-Farley Verified Community Expert]

Several things besides corals consume alkalinity. Two that may be more prevalent in a new tank are rising nitrate, and abiotic precipitation of calcium carbonate (often unseen).

Those things may be slowing down as the tank ages.