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Adding CO2 to the aquarium can be complicated, but with the right accessories it becomes relatively easy. Also when you need to attach multiple aquariums to one system, you can find everything you need here.
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