I don't even use buckets to drain the water, the tank is by a window. But I do have to use them to refill, otherwise I'd have to put peek into the cooler, along with the dithers, and refill with the hose, and wait for the water to warm up because it's 50 deg from the hose.
See? I have to fill with buckets, so I'm quitting for now. Cleaning rabbit pens isn't nearly as strenuous as water changes, or toddlers! And since I can't get rid of the toddler, the fish has to go.