That's interesting. Now that you are testing Alk so frequently, what do you consider stable?
I'm using a calc reactor, and usually I see no more then a .25-.5 shift through out the day based off of testing every 4 hours. I experimented with testing every 1 to 2, but was going through testing solution to quickly and didn't see much more of a difference. With all of that said, these past couple of weeks Ive had a heck of a time keeping things stable and I cannot seem to figure out why. I'm finding my Alk going up about +1 dKh and out side of my range, resulting in me trying to bring it back down in range, so more changes, slow change, in the drip rate and bubble rate in my c02 reactor. I've never tried to do the math on what my tanks actual consumption is and have been. Hard to manage precisely.