I have used melafix, but ran out---gotta get more to keep on hand! Wondering if I can add the melafix in about a week or 2?? Wondering if the coppersafe will interact w/it? Coppersafe is supposed to treat the tank for 1 month. Don't want to keep this guy in the QT for a whole month. His mouth looks much better today, but isn't eating today??