If you're doing a 30% water change, refilling almost ten gallons with a pitcher must take way too long. A siphon hose is much easier and faster. Don't buy one of the hoses from a fish store with the "specialty siphon valve attachment". They charge $30-$40 for a few bucks worth of hose and a useless plastic valve. 20 feet or so of 3/8 or 1/2 inch tubing is only about $8-$10 at Lowes or Home Depot. Stick one end in your tank, hold the other end against the faucet until it fills up, then turn off the water and point it at the drain. It will automatically start siphoning. To fill back up, attach a nut that will fit around your tubing and fit the thread after you twist off the spray nozzle of your sink ($1.50) and turn your water on. This makes the whole process hands free so you can plant, 'scape, and do whatever while its draining and filling up.