Name of the eco friendly ball where you never have to feed the living fish inside? I once came across a Glass ball filled with water, some type of plant and little shrimp things.This ball is completely sealed so it cant be opened.this is because you never have to feed the shrimps things and yet they reproduce and the system can go on for many many years, maybe forever.Hope you know what im talking about.

Other Answers (7)

• It%26#039;s called a Biosphere.
  Dunno where you can get one though. 7% 1 Vote Abstract:A container, having a sealable closure, has included therein distilled water, one or more aquatic plants, one or more herbivorous fish, an aquatic algae eating animal, inert particulate material and measured amounts of certain elements. The elements are nitrogen, potassium, phosphorous, calcium and magnesium. An air space is left at the top of the container and a pinhole provided in the closure. This shelf perpetuating, sealed aquarium requires no air pump or heater, and fish food is not added; however, sufficient light to maintain the aquatic plants in healthy condition is necessary. 7% 1 Vote 14% 2 Votes 7% 1 Vote 14% 2 Votes