Thanks Jim, what would be nice is a way to isolate each tank, in your case maybe having an additional HT to treat specifically any fish.
BTW, used Maracyn Two on my fish today, (He is still alive), Lee recommended double dose at first and hope for the best, good thing I got the medicine cabinet on time, it has been very resourceful as of lately.
My LFS has all my complete fish list, I think they will take all of them (Except for the Red Line in case he survives) to the store so they can be sold.
I will reinvent the QT system, Also, I will follow your recommendation, will get the Hydro Sponges, are you using one per isolated space in the QT or in Sump?