How do the python no spill clean and fill work? I know that you attach it to the faucet and that creates the suction needed to vacuum the tank. Then where does the water you add go? Isn't it bad to have straight tap water go into the tank? I'm wondering because I'm tired of lugging around several buckets for a 45 gallon tank, and couldn't imagine doing that for a 240 gallon tank. Thanks for the help
