I got one,
Practice with your gravel filter or python before using it on your tank. Fill up your sink in the bathroom and practice syphoning the water into your bathtub or toilet.
This will prevent you from spilling 2 gallons of tank water on your hardwood floor when the bulb of the gravel filter decides to come undone right as the syphon starts....This never happened to me, but I've heard its possible.
