This is a topic I'm curious about -
Plants consume ammonia and nitrate, and plant photosynthesis creates oxygen - so theoretically, plant life is 100% capable of maintaining water quality, right? And that's how small standing ponds without a current support life - the plants keep the water clean for the animals, the animal waste feeds the plants.
So how possible is that on the micro-level? I mean, how planted would a 20 gallon have to be before it could support 1 Guppy
with no electric filter whatsoever? How planted would it have to be to support 2 guppies? How many fish could ultimately be supported by this method before the fish were producing so much waste, the plants would be overwhelmed and ammonia would start to build up?
Has anyone had any experience or done any research in this areas It's something I'm interested in experimenting with (humanely, of course)...