I've been doing my homework on this and my conclusion is that I still have lots to learn!

However, my first order of business before setting up the stock tank is to optimize the drain/fill process. As I understand it based on your suggestions here and elsewhere on the forum, I have two options:
Option A: Use a Python-style commercial or DIY water changer that does both drain and fill via a sink faucet attachment.
I like the look of the Blue Magic waterbed drain/fill kit, but am not sure it will work for us because connecting it to the sink faucet is not really an option. Connecting it to the bathtub is theoretically doable if we install a diverter tub spout, but my wife is not thrilled with that idea. Has anyone successfully done something like this to drain/fill from a bathtub faucet?
Option B: Use a submersible pump such as the Marineland Maxi-Jet connected to hardware store tubing to drain, and fill separately (from a garden hose routed in from the yard in this case).
Very basic question about this approach: How do you connect tubing to the Maxi-Jet pump for tank draining? I've found lots of videos showing how powerhead pumps are used for water circulation, but I'm not clear on how they work to drain a tank. Also wondering what diameter of tubing you would recommend for pump draining ~75 gal, and if it would be possible to connect a standard 5/8" garden hose.
Thanks again!
