This tank is a study on a self-sustaining ecosystem. It has no filtration, no supplemental light, no temperature control and no suplements. It has been in my office for 2 years now and the only maintenance is feeding, topping off the water, and cleaning the glass every 3-4 weeks. Everything has been healthy in my tank and have had only 1 shrimp loss after 1.5 years. One of the other shrimps consistently has eggs and the danios are happy and healthy, even though I am sure many people will say they need a bigger tank.
Note that the photographs were taken with artificial lighting even though the tank is a natural light tank.
Keep It Simple
Java Moss, Java Fern, Rotala Indica
2 Zebra Danios, 2 Amano Shrimp
Eco-complete substrate, silica sand, gravel and black river stone rocks