I have a fish that needs to be treated and I don’t have a cycled quarantine tank, but a spare 5 gallon. The directions are one packet per 10 gallons, after treating wait 48 hours and then dose again, and then after another 48 hours do a 25% water change. Prime will last up to 48 hours and after that I would normally do a water change if I had fish in an unchecked tank. Can I just add prime again? How do you handle dosing meds without a cycled QT?