KH raising

[IURobert]

Hi all. My new 100G aquarium is now 3 mounts old. I have tested KH once a week. In last 3-4 weeks KH started to be bigger every week without dosing it. I use reef salt from Aquaforest with 8 dKH. Last week i had 10.7 dKH and today i have 11.7 dKH. The only think i did was to dose Polyplab Medic for ich. I use calcium carbonate rock for aquascape and some ceramic balls in the sump. What do you sugest me to do and what could be the cause?

Thank you!

 

[blaxsun]

How often do you perform water changes and what test kits are you using?

 

[Randy Holmes-Farley]

Is nitrate declining? That adds alk.