Aquarium CO2 Cylinders for Planted Tanks

Buy aquarium CO2 cylinders online in India for planted aquariums and pressurised CO2 systems. Aqua Zones offers 2L, 3L, 4L and 5L cylinders in steel and aluminium options for aquarists looking to build or upgrade a reliable planted tank CO2 setup.

Choose the cylinder capacity, material and valve thread according to your aquarium size, regulator compatibility and local CO2 refill facility. You can also pair these cylinders with our aquarium CO2 regulators or browse complete CO2 kits if you prefer a ready-to-use system.

CO2 Cylinder Sizes & Popular Options

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2 Ltr CO2 Cylinder: The CO2 Cylinder 2 Ltr is a compact steel cylinder suitable for hobbyists who want a smaller pressurised CO2 setup. It uses a G5/8 thread.

3 Ltr CO2 Cylinder: The CO2 Cylinder 3 Ltr provides a middle-capacity option between compact and larger cylinders.

4 Ltr CO2 Cylinder: The CO2 Cylinder 4 Ltr is a larger steel option with G5/8 thread, suitable for aquarists who want longer operating time between refills.

5 Ltr Aluminium Cylinder: The CO2 Aluminium Cylinder 5 Ltr is a lightweight, corrosion-resistant option with W21.8 Indian Standard CO2 valve.

How to Choose the Right CO2 Cylinder

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Capacity: Smaller 2L cylinders are easier to place, while 4L and 5L cylinders normally provide longer operating time between refills.

Steel vs aluminium: Steel cylinders are robust and economical, while aluminium cylinders are lighter, corrosion resistant and easier to handle.

Thread compatibility: Always confirm the cylinder valve thread matches your regulator before purchase. The available Aqua Zones range includes G5/8 and W21.8 valve types.

Refill availability: Check whether your local CO2 filling station supports the cylinder valve/thread type you plan to purchase.

Available space: Consider cylinder height and diameter, especially when the cylinder must fit inside an aquarium cabinet.

Aquarium CO2 Cylinder FAQs

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Are the CO2 cylinders supplied filled with gas?
No. The cylinders listed in this category are supplied empty. CO2 filling needs to be arranged separately through a suitable local filling station.

Which CO2 cylinder size is best for a planted aquarium?
The right capacity depends on aquarium size, injection rate and available cabinet space. Larger cylinders usually provide longer intervals between refills.

What is the difference between steel and aluminium CO2 cylinders?
Steel cylinders are durable and cost effective, while aluminium cylinders are lighter and corrosion resistant, making them easier to handle.

Will every aquarium CO2 regulator fit every cylinder?
No. Cylinder and regulator thread types must match. Always check compatibility before purchase.

What thread types are available?
The current Aqua Zones range includes steel cylinders with G5/8 threads and a 5L aluminium cylinder with W21.8 Indian Standard CO2 valve.

Can these cylinders be used with complete planted aquarium CO2 systems?
Yes, provided the regulator and cylinder thread are compatible. You can also combine the cylinder with a solenoid regulator, bubble counter, CO2 tubing and diffuser to create a complete pressurised CO2 system.

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