Changing water with buckets isn't sustainable. You should be changing about 50 gallons of water, and you will get sick of that. When you get sick of it, your water quality will suffer, and you fish will get sick and die.
I personally don't like the Python Clean and Fill system because it requires that the water be running to create suction. That wastes a lot of water, and I don't like wasting water unnecessarily. It works though if it's your best option.
That's why I use a pump. If your tube run isn't too long, you can do it without a pump by sucking on the tube to create suction. My tube run is almost 40', so I have to use a pump. I tried; I just don't suck hard enough.
I personally don't like the Python Clean and Fill system because it requires that the water be running to create suction. That wastes a lot of water, and I don't like wasting water unnecessarily. It works though if it's your best option.
That's why I use a pump. If your tube run isn't too long, you can do it without a pump by sucking on the tube to create suction. My tube run is almost 40', so I have to use a pump. I tried; I just don't suck hard enough.