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Anonymous
I would say that if you set things up properly you could get away without needing to do water changes. However, you still have to top up water lost to evaporation, test your water, and keep up with your filters and other maintenance. You also need the right ratio of creatures in the tank, including microorganisms and your "clean up crew" (snails & various scavengers).
In the end doing water changes is probably easier than trying to keep things perfect without them.
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