You have an amazing tank!
I just stumbled onto this thread. I wish that I would have found it sooner, now I have to find time to read 70 pages.
I have always ran Siporax in my sump, now I am thinking of trying a ZEO reactor like your doing. Where are you running the reactor output to? The sump return pump area?
Long story short, I have switched to a new sump, and basically run the third chamber to the chiller , then to the Siporax Reactor and back to the first sump stage drain area.