I am extremely dry and pointed in text.
Maybe it's because I'm from the east coast, I don't waste time sugar coating things.
I write down my thoughts and done. I won't usually edit it, I just give my info.
The point the I was trying to make, I've had an issue with my tank this week where my alk showed up at 7.7 down from 9 on sunday.
I had just cleaned my Reef waves using vinegar, so I was thinking it was possibly from the vinegar lowering my ALK, which means at some point it was going to spike and I was worrying about that.
The other thought I had, was maybe CO2 in the air and my skimmer being off from the power being out, and my generator running was messing with the oxygen exchange and PH, killing my ALK.
I was fixing it by dosing ALK (fritz), but I wanted to call someone who I see as a genius for help.
He landed on it being CO2, and we made a plan on fixing it. Yesterday I was up to 9.2, so overshot a little bit with the fritz, at this point I'll let my AFR handle it for a few days and see what happens. (CAL and MAG was rock solid where it's been this entire time)
I don't have high nitrates because I do water changes, run refugium, and use synbiotic (usually doesn't get past around 15) to keep it down.
I was trying to give you another train of thought as to why you might be having issues. To me, it read as if you had alk at 8.0ish and didn't know why it lowered. So I was like why isn't he doing water changes, even if not to lower nitrate, it helps in many other ways.
I usually come at people's posts from many different angles, looking for things to fix. While you might be asking one single thing, I'm in "try to help this person anyway you can". Not everyone works that way, and I guess that's my mistake for trying to help figure out everything a person mentions.