Ideas for a 10 gallon water change tank/QT tank

I have a 55gal tank and was wanting to setup a 10gal tank underneath the 55gal....This way my water is ready to go when I do my water changes...I would also have a heater and a powerhead in that tank ....My question is what kind of plumbing would I need, to get the water back into the tank?



I would also like to use this 10gal tank as a QT????



Thoughts on both ideas please!!!!





Thanks

Justin