Hey tang daddy, thanks for the story
In all seriousness, I appreciate you taking the time to reply. I never dose anything without measuring a deficiency which is why I was so baffled with that whole swapparoo! In any case, I've been dosing Alk supplement and the levels are rising at an expected rate, now up to 8.0 which agrees with what I've dosed. I also tested Mag tonight which came out at 1070ppm, so I dosed to bring that back up to 1300. The Calc supplement is Seachem Reef Advantage Calcium, same stuff I've always used.
When things settle down and corals start growing quickly again I may consider automating the dosage of Calc and Alk to keep up with things (already have 1 dosing pump).
I'm still baffled about the cloudiness though. Aside from the Calcium being higher than I'd like the params are now back in the acceptable range, but the water is still just as cloudy as ever. I think the only possibility left is a stubborn bacteria bloom that the Microbacter doesn't seem to be offsetting. I'm working on a UV sterilizer as a last stab in the dark.