So I’ve been dosing 2 part for a while now. Couple months ago I switched to Kalk in my ato. It couldn’t keep up with my tanks demands so I’m running Kalk and dosing brs 2 part. Tanks only been using about 40ml of soda ash daily. I have been using Salifert but last week bought a Hanna checker for alk. I’ve been testing daily for a week and getting 8.7-8.8dkh so I dose to bring it up to my target of 9.0dkh. Tonight I just tested and got 8.5 wanted to be sure so I tested again and got 8.4. What do I need to do? I have a 125 mixed reef 30 gallon sump. Tank is 2 yrs old. What would make alk level drop more today than the previous week?