So you just refill the evaporated water? And never make water changes?
Here in Germany I know of a community of aquarists who never change the water in their tanks. There is an “Altwasser” (=old, unchanged water, I don’t know an English term for it) forum as well ….. very interesting.
The aquarium as a miniature eco system, with as little intervention as possible.
An appealing thought for somebody like me – already using only rain water and natural components – and no technics.
What do the others think, and how is your water changing frequence?