Clscea DIY CO2 kit setup and usage tips of G211
For a beginner of aquarium enthusiast, or you don't want to spend too much on aquarium, G211 is a good choice.
It is a complete kit (include a 4-in-1 CO2 diffuser). You only need to prepare 2 coke bottles, citric acid, baking soda, and some tap water.
See more about the item: https://www.amazon.com/dp/B0BL92SGW4?...