Starting from this question I have another one. I was not able to find an answer, although it might exist.
Is it possible to populate a fish aquarium in such way that it requires "zero" maintenance?
- which fish?
- which "food"? (worms, shrimps...)
- which plants?
- which hardware?
What do I mean by that:
- all the food grows there (worms, shrimps, plants) in enough quantity for food and for population maintenance;
- the fish have full life-cycles (get born, live, die in-there); at least some of the fish;
- can make it with as few devices as possible: heaters, air pumps, filters, feeders, lights...; my best guess is that at least a mechanical water filter is necessary;
- should be free of pests (or: pests will be naturally removed by the ecosystem - snails, algae, food colonies...);
- should be "as small as possible";
- should look acceptably good;
- should "decently" survive electric power failures without battery-backed or combustion-engine backed power supplies; what would be the longest time expected before irreparable damage happens to the ecosystem?
I have managed something "close" with my bowl:
- no air pump;
- no artificial light (no live plants either);
- long lived healthy fish;
- only mechanical filtration with some bubble making (I allowed the filtered water to fall on the surface of the aquarium water from small height);
- filtering medium washed 2-3 times per year;
- some dry food added daily;
- some water added to compensate for evaporation;
I am aware that some of the conditions seem conflicting, but I am curios to learn from your experience what is the best I could get (IF I would start this endeavor).
Of course, a considerably large pond connected to flowing fresh water will be the best, but that is out of the question.