Correct, but I would rather perform a water change then introduce chemicals into my aquarium even if they are safe. Now don't get it confused, I use chemicals to remove my chlorine but I let that water sit before it's introduced. I do not pour chemical directly into my system, that's bad practice. That's me personally and I don't mention practices that I do not perform.
I've never dosed with vodka. Can someone explain to me how it increases anaerobic bacteria production? I'm curious and don't feel like looking it up just now.