Pah feeding time makes mine spazz

On a sad note, I am now using a 1 gallon bucket for medicating my koi plakat :/ Stupid store.... She came to me sick and is now showing symptoms of columnaris!

Now the one 1 gallon is quarantined, she and all objects used for her will be too until further notice. She only lays on the bottom, poor baby.
AND that is another use for a one gallon. Medicating. I know some people had told me to use a 5 gallon. But then I would feel the urge to break down the tank, sanitize it with my vinegar/hot water mix twice over, rinse three-five times, and then start it up again. Why would I do that? >.>