Made some large changes. As a reminder, a significant portion of this tank's history is documented with my Acan issue thread (below) which has led to a less active tank thread:
https://www.reef2reef.com/threads/acan-lord-and-chalice-tissue-recession.315392/page-3#post-3929172
Fortunately, the acans look much happier now - some tissue recession still, but otherwise much happier. I am interested in removing the shrimp. I don't have any hard evidence it is him though.
Anyway, 2 major updates to the tank: I added a BRS 2 stage GFO and Carbon reactor which i have seen immediate results, at least in the water clarity. PO4 was at .08 this morning, and I was honestly expecting it to be lower. I will give it some time. I also took off the Kessil a360WE and am now running a Radion XR30 pro G4. I became a little concerned about having a single point light and that I could be doing better with multi point light. I'm not really sure why I went with the XR30 over a second 360WE, which would have been just as good. I was getting great results with the Kessil, but still had significant shadowing all over the tank, especially on the new acros I got from Battle Corals, and I wanted them to do well.
dKH is still dropping significantly faster than the other parameters, so I am continuing to watch that the closest. I was not able to address the extra high magnesium found from the Aquamedic results. Considering switching to Coral Pro salt, as it seems to mix with a higher dKH and a lower Mg.
One clownfish was going nuts on the hammer, so I moved to the Lagoon. I'm getting great growth on sunny d's in this tank. Also fighting a minor population of Aptasia, but i'm not worried about that yet. Lost a very pretty Rhodactis mushroom that got buried in the sand while on vacation. Probably a crab/diamond goby team effort.
Pics in following post.