CO2 Indicator Kit (Drop Checker)

Measure visually in real-time the CO2 levels in your planted aquarium. Great for fish safety and plant monitoring plant growth. 

Fast and free shipping within the U.S. on orders over $49!

Worldwide free shipping on orders over $199!

Q: What is the CO2 Indicator Kit used for?

A: It is designed to visually monitor CO2 levels in your planted aquarium, helping you maintain safe and effective carbon dioxide levels for plant growth.

Q: How does the CO2 Indicator Kit work?

A: The indicator uses a colour-changing solution inside the drop checker. As CO2 levels change in the aquarium, the solution changes colour to show whether levels are low, ideal, or too high.

Q: Why is monitoring CO2 important?

A: Stable CO2 levels help plants grow stronger and healthier while reducing the risk of stressing fish or shrimp from excessive CO2.

Q: What colour indicates ideal CO2 levels?

A: In most indicator solutions, green typically represents an ideal CO2 range, blue indicates low CO2, and yellow suggests CO2 may be too high.

Q: Is this suitable for all planted aquariums?

A: Yes, it is ideal for nano tanks, aquascapes, and larger planted aquariums using injected CO2 systems.

Q: Is it easy to install?

A: Yes, simply fill the indicator with the supplied solution and place it inside the aquarium using the included suction cup or holder.

Q: How long does it take to show readings?

A: Most CO2 indicators respond gradually and may take 1–2 hours to reflect changes in CO2 levels.

Q: How often should I replace the indicator solution?

A: Replacing the solution every 2–4 weeks is commonly recommended for accurate readings.

Q: Can I use this in shrimp tanks?

A: Yes, it is especially useful in shrimp tanks where maintaining safe CO2 levels is important.

Q: Is this more accurate than pH charts?

A: It provides a simple visual reference for ongoing monitoring and is often easier for hobbyists to use day-to-day than relying solely on pH/KH charts.

Q: Can beginners use this product?

A: Absolutely. It is one of the easiest ways for beginners to monitor CO2 safely in a planted aquarium.