CO2 Glass Drop Checker Set

The CO2 drop checker set allows you to monitor the carbon dioxide concentration in your water column.  Knowing how much CO2 is being pumped into your aquarium is crucial because plants need it to grow but too much will kill livestock.  Using a drop checker is an easy way to get a rough idea of how much CO2 is present in the water.  


1 x glass drop checker

1 x syringe

1 x drop checker solution


1. Add water into the drop checker (use 4 dkH water for best results)

2. Place several drops of pH solution into the drop checker and mix it with the 4dkH water

3. Place the drop checker on the rim of your tank with the open end penetrating the surface of your aquarium water line

How to read:

Blue = little to no CO2

Green = ideal

Yellow = too high

*This item qualifies for free shipping! 


    $ 18.99

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    Because we love our plants so much and don't want to let them go, we only ship on Monday. Just kidding!

    For the safety of these magical plants, we only ship Monday through Wednesday, and Friday. Orders placed after 1pm Pacific Time will be shipped the following day. 

    Rimless aquariums and other hard goods will be shipped Monday through Friday via UPS Ground or freight.  When purchasing plants/livestock with any hard goods, they will sometimes be shipped separately; but don't worry, we'll be sure to keep you updated with your purchase!

    Please make sure your shipping address is correct as we will not be held responsible for DOA due to an undeliverable addresses.



    Hard goods can be returned up to 30 days after purchase for a full refund as long as the product is unused and new in box. We offer store credit for items that have been opened and used. Customer will have to pay for return shipping freight. 

    We are unable to accept returns for perishable items such as plants or livestock.  However, feel free to reach out to us if you are unsatisfied in any way! We do provide 100% DOA (Dead On Arrival) protection.


    DOA Policy

    If your plants arrived DOA (Dead On Arrival), please provide a clear picture of the plants sealed in its original packaging within 12 hours of the package arrival at the shipping address. 

    Send all pictures, along with your order number to or through Facebook Messenger.
    During winter (under 50°F at your location), please remember to add a heat pack to your order to receive our DOA guarantee.  Orders without the purchase of a heat pack will not qualify for DOA replacements, refunds or credits.



    Don’t worry, we’ll take care of your order as long as it fits within the guidelines above!


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