For a Start into CO2 Fertilization
Carbon dioxide (CO2) is the basic plant nutrient and allows adjusting a slightly acidic pH value, as it is preferred by many plants and fish.
The sera CO2-Start fertilizer system is easy to install and operate. It is ideal for smaller aquariums up to approximately 120 liters (31.8 US gal.). sera CO2-Start consists of an optically unobtrusive sera CO2 diffusion reactor and the corresponding sera CO2-Tabs plus.
This convenient and uncomplicated CO2 fertilization system can be integrated into the aquarium even by beginners without any previous knowledge entirely without any problems.
| Component | Details |
|---|---|
| CO2 Diffusion Reactor | Optically unobtrusive, designed for small aquariums |
| CO2-Tabs Plus | Used to generate CO2 for plant fertilization |
| Compatible Aquarium Size | Up to 120 liters (31.8 US gal.) |
FAQ
How does the sera CO2-Start system work?
The sera CO2-Start system uses CO2-Tabs plus to generate carbon dioxide, which is then released into the aquarium via the diffusion reactor. This provides essential CO2 for plant growth and helps maintain a slightly acidic pH level.
Is the system suitable for beginners?
Yes, the sera CO2-Start is designed to be easy to install and operate, making it ideal for beginners with no prior experience in CO2 fertilization.
What is the maximum aquarium size supported by this system?
The system is suitable for aquariums up to 120 liters (31.8 US gal.).

Brian Bell –
Installed the sera CO2-Start in my 90-liter tank and it worked perfectly. The setup was simple and the plants grew noticeably faster. No issues with pH stability or leaks. Great for new aquarists.
Jacob Welch –
The CO2-Tabs plus and reactor work well together. I noticed better color development in my water plants. The reactor is discreet and doesn’t affect the tank’s appearance.
Owen Butler –
As a first-time CO2 user, I was nervous about the setup. The sera CO2-Start made it easy. Plants are thriving and the water chemistry has stabilized well.
Richard Mackay –
Works reliably in my 100-liter tank. The tabs dissolve smoothly and the CO2 release is consistent. I didn’t need to adjust anything after initial setup.