nah, just siphon it out using good old fashioned lung power. you may not even have to ever do that, since it will be more like a flower pot instead of an entire viv bottom. but it will be a nice feature to have in case you do need it. and if you place a valve on the end of the, and keep it below the bottom of the tank line (outside the tank of course), after you siphon once, just close the valve. next time you need to siphon, open the valve, and voila, instant drainage.