CO2 added into the water is absorbed by aquatic plants to carry out photosynthesis as producing a lot of oxygen. Fish, shrimps and microorganisms use this oxygen to breathe and to live. To define methods for growing aquatic plants, ADA has been working on the development since its establishment.
That is how the CO2 System with small cartridge and regulator was created and commoditized ahead of the rest of the world in 1985. It definitely made it easy to grow aquatic plants.