Wowza, I haven't updated this thread in a long time...
I nearly sold the tank. I battled long and hard against dino's on a daily basis for months and finally the tank is dino-free. I siphoned off the rocks every day, quit doing water changes, changed salts when I resumed water changes, raised the pH, black-out after black-out with increasing durations, etc.. I recently switched from using a Kati/Ani to a Water Saver RODI and changed my water storage containers...
...haven't seen any type of bloom since I made those changes. Yesterday I also added my two VorTech MP40wES to the system to supplement the flow from the Gyre. The tank is finally seeing progress for now.
I had a bunch of fish in QT, all of which died except the PBT that is STILL in there. I had a heater malfunction and the temp approached 100*F and really injured the fish...
...it's looking much better now and will see the DT in about two weeks.
For now, I'm going to let the DT rest and continue to do water changes. After the PBT goes into the DT I think I'll add a flame angel and midas blenny but I'm not going to make the mistake of adding too many fish to the QT again. I was doing daily 5g water changes and that got old, fast.