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Green Aqua Glass CO2 Drop Checker (Nano)

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Green Aqua Glass CO2 Drop Checker (Nano)

Drop checkers are used to monitor the CO2 levels in the aquarium: the pH indicator solution inside the bulb section will change color according to the amount of CO2 dissolved in the aquarium water. Blue and dark-green colors will indicate low CO2 levels, light-green (lime-green) is OK, yellow is too much. Note that drop checkers always have a delay of 2-3 hours, so they show a CO2 level that was present hours before the reading (delayed reading).

The drop checker is the best tool to monitor CO2 levels continuously. With some practice and experience it can be a precise tool to measure the amount of CO2 dissolved.


  • Turn the drop checker almost all way upside down holding the suction-cup.
  • Start dripping the blue CO2 reagent into the drop checker.
  • While dripping, modify the angle of the upside-down-held drop checker, allowing it to fill up with liquid.
  • You should stop when the modified angle is so horizontal that the reagent is no longer flowing down into the spherical part (bulb section).
  • Turn the Drop Checker back to normal position (with the opening at the bottom)
  • Clean the inside of the opening free of any drips of reagent with a kitchen towel.
  • Put the drop checker into the aquarium using the suction-cup.

Do not forget, that CO2 is not dissolved uniformly into the aquarium water. On a computer model it would look more like "clouds in the sky"... Levels are higher at the injection point and they will be lower at far sides of the fish-tank, with slow water movement. So Drop Checker values will only show the amount of CO2 dissolved at the location of the measurement. Make sure to move the Drop Checker to other parts of your aquarium in order to discover the different levels. Always leave the DC at the same place for at least a day to allow it to calibrate properly. Do not forget, that it shows the levels with 2-3 hours delay.

Do not make any sudden changes in the CO2 bubble count. That can result in algae bloom or fish health problems (yellow drop checkers will often signal fish health problems). 95% of all algae-issues are CO2 related! Make small changes and observe the Drop Checker color change in 2 hours.

IMPORTANT: You will also need a Drop Checker Reagent (sold separately) to use this item.

More Information
NameGreen Aqua Glass CO2 Drop Checker (Nano)
Weight (kg)0.100000

Our main shipping provider - GLS is only delivering our packages up until a certain weight. In some extreme cases - involving shipping of big aquariums, furniture - we will calculate a custom shipping cost, after receiving your order. We will only ship the purchased products after you have confirmed this shipping cost with us.
Please be informed, we charge an extra 10 EUR / aquarium on all aquarium orders for special packaging and care within the shipping fee.

Our goal is to deliver the plants as quickly as possible to your address, so we are making regular (two times per week) orders to our manufacturers and will send you the fresh plants with GLS as soon as they arrive to us. We also have a uniquely high stock, with hundreds of plants. Please read our terms and conditions.

We would like to inform you that according to the EU regulations we are not allowed to ship live animals or dangerous goods (such as CO2 bottles in example) through our delivery partners. Please note that these can only be picked up at our store. The list of the dangerous goods on sale by Green Aqua can be found here.

Please protect your purchase by always inspecting the package right after delivery. In case of visible damages on the exterior of the package you will need to sign a written damage form IN THE PRESENCE of the delivery agent! We can only guarantee replacement or resending of any goods if a written damage form or claims form is filled at the time of the delivery! With seamlessly undamaged packages on the exterior, you have 7 days to report any missing or damaged goods from the interior of the package.

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