CO2 supply is crucial for a planted aquarium as it helps to maintain optimal plant growth and suppresses algae growth. However, optimal CO2 levels are critical, as lower or higher CO2 levels can harm plants and aquatic pets. Therefore, a proper check to monitor CO2 levels is necessary.
Content Table
In this article, you will learn about what a CO2 drop checker is, how it works, its importance, and different scenarios to have or not have a drop checker. Moreover, in the end, you will find a cost-effective CO2 drop checker and how to use it.
CO2 drop checker for planted aquariums
What Is a CO2 Drop Checker?
CO2 supply is crucial in planted tanks. It helps in maintaining plant growth and suppressing algae bloom in the tank. Therefore, it is necessary to monitor the CO2 level. Low CO2 leads to algae blooms, and higher levels lead to fish gasping. Without proper CO2 level monitoring, it is only an assumption that can prove fatal.
In this regard, CO2 checkers come to the rescue.
The CO2 drop checker is a device that helps to monitor the CO2 level in the tank. It helps to constantly check the CO2 level, i.e., whether low, high, or optimal. Usually, it indicates the level by showing different colors.
How Does a CO2 Drop Checker Work?
In the CO2 drop checker, a CO2 indicator solution is present. When the device is inserted in the tank, a small volume of tank water enters the drop checker. It reacts with the indicator solution and produces acid, carbonic acid, in the tank. If the acid level is higher, the pH drops, and the color indicator shows the acidic coloration. A similar phenomenon happens for higher pH.
| CO2 levels | Indicator Solution Color |
| High CO2 | Yellow or green solution |
| Low CO2 | Blue solution |
In a nutshell, here is the process.
Monitoring the CO₂Levels for the Planted Tank
CO2 monitoring is far more important in the tank as it is crucial for both aquatic pets and plants. Here are a few reasons why to supply CO2 in a tank.
Importance of CO2
- Plants use it during photosynthesis.
- Low CO2 levels lead to redundant plant growth.
- Low CO2 levels cause an algae bloom in a planted tank.
- Overwhelmed CO2 levels cause suffocation among fish.
Monitoring regarding plants
In contrast to plants, aquatic pets require oxygen instead of CO2. If the CO2 level is higher, it drops the oxygen level in the tank. The reduced oxygen level causes stress, and you can see the fish gasping at the water’s surface.
Monitoring regarding Fish
In contrast to plants, aquatic pets require O2 instead of CO2. If the CO2 level is higher, it reduces the O2 level in the tank. The reduced O2 level causes stress, and you can see the visible gasping of the fish at the tank surface.
In short, to maintain a balanced ecosystem in a tank, it is required to keep a balanced CO2 level in the tank. Any guesswork leads to disaster in either way, i.e., plants or aquatic pets.
monitor CO2 levels
Do I Need a CO2 Drop Checker Kit for Planted Aquariums?
If you are injecting CO2 in your tank, it is necessary to have a CO2 drop checker. Here are the different cases to have or not have a CO2 drop checker in your tank.
| Required | Not Required |
| You are running pressurized CO2 in the tank. | You have a low-tech tank. |
| You have a DIY CO2 system in your tank. | You have low light, and you want to keep the plant growth slow instead of high or medium. |
| Your planted tank has medium to high intensity light. | You are a beginner and have only a fish tank. |
| You want to maintain a balance between fish and plants. | |
| You want to avoid the aquatic pet stress and algae bloom. |
hygger HC012 Drop Checker Kit Review
hygger has developed a nano HC012 drop checker kit. It is small in size and provides real-time information about the CO2 level in the tank. It’s a compact and easy-to-use product that any aquarist can afford due to its affordable cost.
Features
- Compact size
- Easy to use
- Work with every setup, i.e., pressurized or DIY system.
- Clear glass allows for a clear inspection of CO2 levels.
- It is completely safe for fish and plants.
Product Specification Table
| Feature | Details |
| Model | hygger HC012 |
| Material | Glass |
| Height | ~2 inches |
| Mount | Suction cup |
| Included | Solution & manual |
| Uses | Freshwater planted tank CO₂ monitoring |
| Safe for | Fish, shrimp & plants |
How to Use?
It requires 4 steps to properly install a hygger Nano CO2 drop checker in your tank.
- Place the drop check with its opening vertically upward.
- Drop 15–20 drops of the test solution.
- Rotate the drop checker in the direction shown in the figure to allow the monitoring solution to flow into the sphere. You can gently shake or flick the spherical part of the checker.
- Vertically place the drop checker into the water by fixing at the tank’s wall.
Pros
- Instant feedback.
- Cost-effective for beginners.
- It does not require any tools to install in a tank.
Cautions
Apply the cautionary things for superior results.
- Handle with care, as it is a glass product.
- Regularly change the indicator solution in the nano CO2 checker.
- Suitable for small to medium aquariums only.
HC012 drop checker kit review
The Usage Experience with CO2 Drop Checkers
- Place the drop check with its opening vertically upward.
- Drop 15–20 drops of the test solution.
- Gently rotate the drop checker so the spherical part fills.
- Attach it with the suction cup about 10–15 cm below the surface.
- Install the CO2 checker in the mid-tank or in the lower half of the tank, as water mixes well in these portions.
- Give it some time for acclimation. Usually, it takes about a few hours to show the exact values.
Color at various CO2 levels
| Color | Action Regarding CO2 Supply |
| Blue | Increase CO₂ slightly |
| Green | Perfect — keep as is |
| Yellow | Reduce CO₂ immediately |
CO2 Checking Frequency
Although you can check the CO2 level any time with the CO2 drop checker. However, it is recommended to regularly check after 2 to 3 days. If you have a new setup, then check it daily.
CO2 Checking Frequency
Concluding Remarks
Optimal CO2 supply makes the tank a habitable space for plants and aquatic pets. A CO2 drop checker helps to achieve this goal. The hygger CO2 drop checker helps to achieve this balance in a cost-effective bracket. However, it is necessary to check whether you need a CO2 drop checker or not, consult through these conditions.
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