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A good CO2 system and adding free available CO2 to the aquarium, besides a good fertilization, plays an important role to the growth of the plants in the aquarium. By adding CO2 to the aquarium the pH of the water lowers and makes it acidic, just as most plants and fish love it.
These are the refill cylinders for the Tropica CO2 System 60. Tropica CO2 System 60 is a cheap solution to add CO2 to the aquarium.
Contents: 3 pieces of 5000 ml CO2
Tropica CO2 System Nano Cylinder refill cartridge.
Contents: 95 grams