If you have a big question about it, it is basically a totally enclosed freshwater ecosystem that is completed with algae shrimps and micro-organisms in glass sphere and they work with self-sustainment. You don’t need to do anything to maintain the water. It works for those who are super busy but still want to have some fish with minimal care.
It only works well with indirect light and stable room temperature. You don’t have to feed or change the water and the average life span is about 2 to 3 years. Cool, isn’t it?
Closed Freshwater Aquatic Ecosystem by EcoSphere