I see some IO veteran here and using IO with success. I use RedSea Blue in my reef tank, but had some really sad experience with IO in my QT process. I've lost a good number of fish overnight if not faster when adding to *newly* mixed IO salt water. I'm starting to believe my process of mixing in a couple hours is too fast. The water test fine with refract plus temp check so that's not killing the fish , but I'm starting to think that the pH or oxygen is the problem from fresh batch. That there needs to be some kind of time allowing it to settle and balance. Thoughts?