10-30-2011, 09:52 AM
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There is sometimes a misconception that more, better filtration will somehow reduce or eliminate the need for routine water changes. As the others point out, this couldn't be further from the truth. Although good filtration is necessary and some types of filtration 'may' push out the frequency or reduce the required volume of the water change, the fact is that the routine water change is the number one best way to reduce the pollution in the aquarium. In nature, fresh water is re-made fresh by the routine introduction of rain water. In the tiny closed containers we have, we have to simulate the rain.
To answer you question, yes, a canister has a single inlet and outlet, most often positioned in opposite ends of the tank. Modern canister filters are excellent filters for larger tanks. Your tank is a little small for a canister, but there are small ones available.
There are also some good HOBs out there and if you're planning to have a lot of plants, as Byron often says, you may need only a small sponge filter to keep things neat.
But again, the weekly water change is still required and is the best way to manage your tank.
Like some others, I do a 50% weekly water change EVERY Saturday morning. If you can easily siphon to a drain or outdoors and get a hose hookup for a faucet, weekly tank maintenance is a breeze.
The solution to pollution is dilution.