Alex,
I only use the Python on the upstairs tanks, with no restrictions on it (I don't use the pump). In the fishroom I use a 1" hose, which can drain a 55 gallon in about 5 minutes.
There are 10 kinds of people in this world; those who understand binary, and those who don't.
So then you are at 1/2" too.
1" nice, I put that to my pump (working on the fish room) I get about 20Gl per min but only 90gl connected (testing). I use connectors with siphons to clean tank bottoms.
Had to many kinks with old Python so got that thick reinforced 1/2" inside tubing this way if I close valve it doesn't expend like it's going to burst, (mind you my original Python is 7 years, so it seen it's share of water changes). For fish-room I'll go with PVC.
Take care.
Alex
Destiny is a matter of choice.
...like I said.