Dymax CO2 Indicator Solution
The Dymax CO2 Indicator Solution reacts to the concentration of CO2 within an aquarium and will change colors based on levels. Blue indicates a low CO2 concentration, green indicates an appropriate CO2 concentration, and yellow indicates a high CO2 concentration. The solution takes 1-2 hours to react and change color.
Color Reference
| Color | CO2 Level |
|---|---|
| Blue | Low CO2 concentration |
| Green | Appropriate CO2 concentration |
| Yellow | High CO2 concentration |
FAQ
How long does it take for the solution to change color?
The solution takes 1-2 hours to react and change color.
What does the color change mean for my aquarium’s CO2 level?
Blue indicates low CO2, green indicates appropriate CO2, and yellow indicates high CO2 concentration.
Is the solution safe for fish and plants?
Yes, the solution is specifically designed for use in aquariums and is safe for fish and aquatic plants.

Keith Black –
This indicator is very reliable. I noticed the color change clearly after adding it to my tank. It helped me maintain a stable CO2 level without needing to adjust my system constantly. Easy to read and works well with my planted tank.
Simon Berry –
The color transition from blue to green was noticeable within a few hours. It’s a simple tool that gives me peace of mind about my CO2 levels. I use it regularly and it’s become a staple in my aquarium maintenance routine.
Grace Ball –
I’ve tried several CO2 indicators before, but this one is the most accurate. The green color means my tank is in balance, and the yellow warning helps me avoid overfeeding or over-aeration. Very useful for beginners and experienced aquarists alike.