Any update on your recovery? I just went through the same. Found a rusty magnet in my rodi barrel after a couple months of watching odd and random heads die off of blastos, chalice recession, torch tissue recession, stn on sps starting with a slow creep from the edge, random euphyllia polyp bail. I’m 3 weeks post magnet removal but like you said, the damage is already done. Rust is a no go for your system. If you have it, in my honest opinion it’s only a matter of time before it catches up. Mine was being introduced via auto top off. Glad I caught it finally but not before losing thousands in livestock.
After about 6 months, I would say I’m back to normal if not better now that my parameters have leveled out and are stable. The Trident has helped, along with the auto dosing.