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We were taught as early as school that the photosynthesis of plants requires carbon dioxide. We are all carbon-based beings, along with plants, so it is essential to life that we have access to them.

However, the carbon dioxide normally found in an aquarium is very little for our plants. We know of only 10-15 types of plants that vegetate in the absence of CO2. It is almost impossible to keep other plants healthy. This problem can be remedied by CO2 dosing.

Because of the CO2 injection, we can “afford” to illuminate the aquarium brighter, so we can achieve a more vivid and vibrant effect with the look in our living space.

As a result of CO2 injection, the plants will be healthier and more beautiful, and the aquarium will start to glow in fresh green colors. The sight of a high-tech planted aquarium is unattainable, a new world will open up before us. If we already know about ourselves that we want to operate our aquarium in the long run, then it is definitely worth investing in a CO2 system.

Why is CO2 leaching necessary?

“Aquatic plants photosynthesize when their leaves are exposed to the right light. To do this, they use the nutrients and CO2 (carbon dioxide) in the water to produce glucose and oxygen. Aquatic plants use glucose to grow, while oxygen released from their leaves, which are used by fish and microorganisms in the aquarium to breathe in. CO2 is introduced into the aquarium by leaching and exhalation of fish and microorganisms.If we keep a lot of plants in the aquarium – under strong light, the plants quickly consume them in the water CO2 depletion during photosynthesis The depletion of CO2 in water causes plants to stop photosynthesizing.If such conditions exist in the aquarium, the plants cannot thrive nicely and healthily.If there are few plants in the aquarium or the lighting is dim, on the other hand, if it is not necessary to dissolve a large amount of CO2 in the water. and their lighting is strong, CO2 will sooner or later run out of water. Sufficient CO2 must be dissolved in water to uniformly photosynthesize plants. “- ADA Plant School

How much CO2 should we add?

The answer is only seemingly simple: the ideal level is 30 ppm (mg / liter) CO2. We have two problems with this: CO2 gas is not evenly present in the water, but can look most modeled like “lamb clouds in the sky” – less in drifting, less distant places, more elsewhere. Furthermore, CO2 cannot be measured accurately at home.

However, we have good news, over time, every aquarist will experience the CO2 level needed in their own aquarium, and with the bubble counters and endurance tests available, the desired level can be set quite skillfully.

The level of CO2 at 30 ppm (mg / l) has no detrimental effect on fish health, but we must be very careful not to exceed this level even for a short time, because our pets can easily die in CO2 poisoning. The first sign of this is that our fish are “ticking” on the surface of the water. This phenomenon occurs because too high a level of CO2 also increases the oxygen demand of fish, with much more oxygen on the water surface due to gas exchange.

The second, more serious symptom of CO2 poisoning is when our fish move back and forth in the water, sometimes swimming upside down and visibly losing their ability to orient themselves. They are more difficult to recover from this condition, and some of them are usually destroyed. However, a quick change of water and aeration can still save some of the stock. The third phase is fish death.

However, if we adjust the CO2 level properly, there is no danger to our pets. When observing the aquarium, also keep in mind that the CO2 level is closely related to the water movement in the aquarium, if we set the CO2 values ​​to around 30 ppm when using a newer and cleaner filter, this level will increase as the flow slows down and problems may occur. Reduce the number of bubbles if you cannot clean the filter.

What are the CO2 release methods?

If we do not want to install a CO2 system, we still have a final solution, to use water treatment plants that contain carbon-based compounds in the form that can be taken up through the cell wall for the more demanding 10-15 species mentioned above. An example of such a product is Easy Life – Easy Carbo.

The second method, which we strongly recommend, is the use of yeast CO2. With this home-made method, we can already achieve results similar to high-pressure CO2 systems, but their reliability is very low and we cannot shut off the gas overnight (about the importance of this later).

The third method, and practically the only one that works without compromise, is the use of high-pressure systems. These have versions for smaller (nano) aquariums, and there are sets that can be used for both nano and large aquariums. These will be discussed later. It is important to know that the price of high pressure kits does not change significantly for small or large aquariums, so we can expect similar prices in general.

Means required to dissolve CO2

“There have been many methods of dissolving CO2 in an aquarium in recent years. The most common method today is direct dissolution – which is safe and effective. We use a gas cylinder as a source of CO2, which contains liquid carbon dioxide. For slow injection of CO2 The pressure reducer is suitable for reducing the pressure of the carbon dioxide in the cylinder during a steady flow.The carbon dioxide from the cylinder passes through a ball valve (solenoid valve) with which the injection can be switched on and off, from where the pressure-resistant carbon dioxide A non-return valve is connected to the pressure-resistant pipe. The glass CO2 diffusers and bubble counters are used to dissolve the carbon dioxide in the water. The glass devices are also connected to the pipes. ” – ADA Herbal School

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