Hi John, somehow I missed your build thread?!
Have you ever thought of doing a bacteria test with Aquabiomics to get a baseline of your bacteria since you dose bacteria?
I was battling a tank crash earlier in the year due to stupid human error of trying to dose Ammonia instead of NO3.
My tank stunk and I had to go back into the ugly phase of fighting Dinos and Cyano for about 5 months.
I tried reseeding my tank with PRO Bio, Dr. Tims, etc. I even ordered sand and mud from Florida to reseed my sandbed.
After two weeks of reseeding the sandbed with live sand and mud, I sent an Aqubiomics test. I think the test at least help me see how much diversity I had with bacteria in my tank. Fortunately I did not have any bad vibrio that could kill my SPS. Interestingly, I have aptasia which is kept in check from my Copperband. I was very impressed with the test saying I had aptasia problem just from DNA found in my water sample.
P.S. I just checked Aquatiomics website, they are having a 20% labor day sale in case you may be interested.