Is a Python/Aqueon vacuum appropriate for a 20 gallon tank?

I just upgraded from a 10 gallon to a 20 gallon tank and the glowing reviews about python vacuums make me want to buy one. I am worried that it might be too powerful and empty my aquarium water too quickly to really filter the gravel, even though I don't have an undergravel filter. It looks though like the Aqueon vacuum has a valve to change how fast the water is drained. Money isn't so much of an issue, I just want what would be best for the tank and fish.

Any suggestions?
I've never had a problem with it and I use it on my 10g.
I don't have any trouble with using a python in my 10 gallon tank. =) I wouldn't think you would have any in a 20g

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