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https://www.senzeal.com/blog/guide-for-using-a-co2-drop-checker-in-a-planted-tank-b0486.html

Monitoring and maintaining carbon dioxide levels in the aquarium is crucial to your plant. Using the CO2 drop checker kit is the most convenient and economical way to measure the CO2 concentration in aquariums. The best CO2 drop checker kit is a container for indicating liquids. It will tell you whether your plants have too much, too little CO2 or tell you the correct carbon dioxide concentration. This concentration is a safe level for fish to grow in a healthy environment. This small but very useful piece of equipment is an essential part of aquariums, as it helps you control the carbon dioxide content in the planted tank -an important factor in determining the success of breeding. This article will outline the methods of using a drop checker and recommend the best drop checker toolkit on the market.
The Working Mechanism To CO2 Measurement
There is a certain relationship between pH, KH (carbonate hardness) and CO2. When we add carbon dioxide to the water, it forms carbonic acid, which lowers the pH. The more carbon dioxide dissolved in the water, the lower the pH. The more acidic the water quality is.
Finding ways to lower the carbon dioxide content to raise the pH is for KH. Assuming the same amount of CO2, the higher the KH, the higher the pH. Over the years, aquarists have found ways to use this relation to calculate the amount of the best CO2 diffuser in water. A well-known technique is to use accurate pH and KH test kits to read off the result on a CO2 table.
This method is cheap and easy to do, but unfortunately, the presence of water in other buffers makes it inaccurate. Fortunately, another way to measure carbon dioxide is to use a drop checker. This technique became popular because it allows you to monitor CO2 24/7 by simply looking at it. Additionally, buffers won't have an effect on results. In my opinion, this is probably the most accurate way to measure CO2.
How to Check CO2?
You can easily know how much carbon dioxide (ppm or mg / l) is in your fish tank by looking at the color of the indicator and searching for the color chart included in the drop checker kit.
Green indicates that the carbon dioxide concentration is 26-35 ppm. It is recommended that the best plant growth environment is 30ppm, but maintain a comfortable environment for the fish.
Blue means your carbon dioxide concentration is 25ppm or lower. This means that there is not enough carbon dioxide injected, and you need to adjust your carbon dioxide regulator slightly to get green.
Yellow indicates that the carbon dioxide concentration is 36 ppm or higher. The carbon dioxide content in your fish tank is too high, and you should reduce it.

How Much CO2 Should be in Planted Tank?
Approximately 15-30 ppm (or mg / l) of carbon dioxide is required for a highly demanding aquatic plant to thrive, while a compromise requires 10-15 ppm of carbon dioxide. A CO2 concentration of 30 ppm (part per million) is safe for most fish and inverts and the toxicity threshold can vary considerably, depending on dissolved oxygen (O2) levels (follow Practicalfishkeeping). Basing on these facts, the optimal CO2 concentration for both plants and fish is around 30 ppm. Many successful aquarists also maintain the CO2 level in their planted tanks at 30 ppm.
Maintaining Proper Levels of CO2
The problem associated with maintaining the CO2 concentration level is that gasses do not move as easily in water as they do when dissolved in liquids. The gas diffusion rate across cell boundaries can be as high as 10,000 times slower in water than in air. Therefore, even minor changes in CO2 injection rates or minor increases in light intensity have a significant detrimental effect on the plant's ability to gather enough CO2 to fabricate carbohydrates.
The higher the temperature of the water, the less soluble CO2 is. Since most planted tanks are tropical tanks this makes it even more difficult. It’s been estimated that approximately 90% of the gas is injected into the tank is immediately lost to the atmosphere. 10% or less makes it into the plant.
For more information about drop checkers or to make a purchase, please continue to visit our website senzeal.com or call us.