Fluval CO2 Glass Indicator Set
The Fluval CO2 Glass Indicator Set is designed to help you easily monitor carbon dioxide (CO2) levels in your aquarium. This set provides a clear visual indication of CO2 concentration, allowing you to maintain optimal conditions for your aquatic plants and fish.
How It Works
The glass indicator tubes change color based on the CO2 level in the water. When CO2 is present, the liquid inside the tube shifts from clear to a darker color, indicating the concentration of CO2.
Key Features
- Visual CO2 level monitoring using color-changing glass tubes
- Easy to read and install in your aquarium setup
- Designed for use with Fluval aquarium systems
| Parameter | Value |
|---|---|
| Number of Indicators | 1 |
| Material | High-quality glass |
| Compatibility | Fluval aquarium systems |
| Usage | CO2 level monitoring in planted tanks |
FAQ
How does the CO2 indicator work?
The indicator tube changes color based on the CO2 concentration in the water. Clear indicates low CO2, while darker shades show higher levels.
Can this indicator be used with non-Fluval aquarium systems?
Please contact customer service for compatibility with non-Fluval systems.
How often should I check the CO2 level?
Check the indicator regularly, especially when adjusting CO2 dosing or during seasonal changes in water conditions.

Max Blake –
The CO2 indicator is very easy to use and gives a clear visual read of CO2 levels. I noticed the color change after adding CO2, which helped me adjust dosing without guesswork. Works well with my Fluval system and has been reliable for several months.
Joe Randall –
I appreciate the simple design and how it helps me monitor CO2 without needing a digital device. The glass tube is durable and the color change is noticeable. A small improvement would be a more precise scale, but overall it’s very useful.
Jessica Hunter –
This set has made it much easier to maintain stable CO2 levels in my planted tank. I no longer have to rely on guesswork. The indicator is clear, responsive, and fits well in my aquarium setup.