Sorry to hear it's continuing. It almost makes me wonder if the combination of chemicals kicked off something microbially but that's a frustrating answer (and who knows if at all accurate). I would keep checking things off the list like you're doing starting with RODI water quality.
I agree with Perry keep nutrients in the water column and go back to basics while checking potential hazards off the list. I would be wary of adding much of anything (although I don't see an issue with minimal additions of iodine).
I agree with Perry keep nutrients in the water column and go back to basics while checking potential hazards off the list. I would be wary of adding much of anything (although I don't see an issue with minimal additions of iodine).