Source of Co2 CO2 comes from nature, except CO2 produced by living things and microorganisms in rivers and lakes during breathing. When it rains in the sky, when the rain falls from the sky to the land, the carbon dioxide in the air will penetrate into the soil or flow into rivers and lakes at a concentration of about 100 times to supply the growth needs of aquatic plants in lakes or rivers.
In the artificial aquatic plant pond, in addition to the CO2 generated by the breathing of small organisms and microorganisms in the bottom bed and filter, bubbles will also appear in the pond after changing water, because the newly injected water contains CO2 (tap water is about 3mg\l, pit water 10~40mg\l, depending on the local water source. )。 However, after a short time, the bubbles in the water tank disappear, and CO2 needs to be artificially added to the water to supply CO2 concentration of grass 1.5mg \ L for photosynthesis. Generally speaking, under a certain amount of light, the aquatic plants in the whole tank are growing every day, the volume of aquatic plants is also increasing, and the relative demand for carbon dioxide is also increasing. Therefore, the amount of carbon dioxide should be gradually increased in the adaptation period when the total volume of aquatic plants is small at the beginning of the new tank, and then gradually increased in the flourishing period when the total volume is large, which depends on the foaming degree of aquatic plants' photosynthesis. Don't add CO2 according to the wrong idea of calculating the water quantity in the water tank, such as several grains of CO2 per second. In a word, the amount of CO2 added is limited by the saturation point of bubbles produced by photosynthesis of aquatic plants.
The effect of adding Co2 is 65,438+0. Adding CO2 into the aquatic plant pool with light energy can make the aquatic plants actively carry out photosynthesis, increase the activity of photosynthesis, absorb nutrients in water, grow sturdily and reduce the growth of algae. When aquatic plants grow slowly or stop growing, algae can easily attach to leaves. ) 2. Aquatic plants absorb CO2 and release oxygen after photosynthesis, which will supply the survival of fish and shrimp and the survival and reproduction of aerobic microorganisms that need oxygen in the water tank. Addition of 3.3. CO2 can reduce the PH value, which is slightly acidic in water, which is beneficial to the absorption of nutrients (fertilizers). Reducing the PH value can reduce the toxicity of harmful ammonia and avoid fish poisoning or death.
Second, the supply mode of Co2 microbial decomposition and fermentation method is suitable for aquatic plant tanks within 30cm. Yeast decomposes organic sugar to produce carbon dioxide. The CO2 produced by its fermentation is limited to a small demand, and the ideal effect can only be produced at a temperature above 30℃, so this method is widely used in mini-aquariums. If the temperature is lower than 20℃, the carbon dioxide produced is very small, so it cannot be added into the water from the conduit. Chemical reaction method is suitable for 30cm aquarium. It is produced by the reaction of using various chemicals. After the reaction, with the decrease of the remaining dose, the degree of use gradually decreases.
The Co2 generator is suitable for 10cm~20cm desktop mini aquarium. Because the concentration of CO2 produced is difficult to control (the initial concentration is too high and the later concentration is insufficient, if you add another one, you need to take it out before turning off the lights, because aquatic plants absorb oxygen and release carbon dioxide at night ...), which is inconvenient, expensive and difficult to control.