If you had ozone,
if u had lots and lots of premium rock,
if u have a great protein skimmer,
if u use a kalk reactor, u wouldnt need to do water changes very often.
If is a very useful word. Get my drift? :wink:
Plus, solid waste doesnt break down immediately, and it can lead to unsightly buildups. Not only from a biological standpoint, but water changes help asthetically too.
You could argue that Nature doesnt do water changes. I say to you, the oceans are trillions of gallons mixed around every day. Our tanks usually max out at 300 gallons and are powered by little pumps. :wink:
In oreder to keep balance and order in our pico oceans, we must do water changes to flush out old water and in with new, just like the oceans mix and tumble every day.
A wise saying I have heard somewhere in the infinite reaches of space-"Sometimes there is more to water than just water", and "There is more to reef than meet eye."
BTW, questioning the very basis of the aquarium hobby is a very good way to start a riot.

8)