07-06-2009, 12:16 PM
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The manual water changer mentioned previously is probably your best option; I used to use one with a 55g and several 25g tanks. If you had more tanks or larger ones, a Python or Aqueon water changer would be better, it connects to a faucet (must be threaded, as in for a garden hose) and you syphon out and fill up using the tap. But for one 20g tank not that practical given its cost over a manual one (unless you have other tanks of course).
One question from your first post, how much of the water do you change? You mentioned getting near the bottom, leading me to think you're changing much of the water. A partial water change every week can be 30-40% of the tank volume; I wouldn't recommend more than 50% except in an emergency. And always every week, whatever amount, to maintain a more stable biological equilibrium. Pardon me if I misunderstood your post.