Sealed 5 gal aquarium - 6 years old

This started out life as an aquascaping tank with various types of shrimp and a dwarf lobster. Life happened and I was no longer able to keep up with trimming the various plants and it went crazy.

Eventually I gave up and after the Lobster died I decided to convert it to a closed system just to see what would happen and taped the lid shut to prevent evaporation.

Much to my surprise it has been going really strong. There has been a couple of die offs when moving to different parts of the country but it bounces back pretty quickly. Much better than my other two ecosphere's.