Why change the water in the fish tank regularly?

Because there are too many bacteria in the fish tank, it needs to be changed.

Nitrifying bacteria? Nitrifying bacteria is a kind of aerobic bacteria, including nitrite bacteria and nitrate bacteria. Living in aerobic water or sand plays an important role in the purification of nitrogen circulating water.

life condition

Living conditions of nitrifying bacteria: nitrifying bacteria need water and high oxygen, and can only live in various microporous filter materials such as biochemical cotton, biochemical balls, glass rings and ceramic rings. Only by meeting the supply of water and oxygen at the same time can they survive. Nitrifying bacteria are most suitable for living in weak alkaline water, and grow and reproduce fastest when the temperature reaches about 25 degrees. Its reproduction does not follow the law of separation and free combination.

Matters needing attention

Many fish friends have some misunderstandings about nitrifying bacteria. Some people think that nitrifying bacteria can decompose feces. Some people think that it can purify water and neutralize suspended solids in water. These understandings are inaccurate, or can be said to be wrong. Nitrifying bacteria are producers.

Decompose organic matter

First of all, talk about decomposing organic matter. This kind of heavy physical labor, delicate nitrifying bacteria can not do. It is done by other water-purifying bacteria. In the aquatic ecological circulation system, if there are no other heterotrophic bacteria, the water will be full of organic matter that has not been decomposed by bacteria, and this self-polluted aquarium environment will make it impossible for fish to survive. Therefore, they are often regarded as Depth Charge with self-purification of water quality, and their importance is no less than that of nitrifying bacteria. This kind of bacteria is ubiquitous in all kinds of environments, and its reproduction speed is quite amazing. In an ideal environment, most heterotrophic water-purifying bacteria can multiply twice by themselves in only a few tens of seconds, usually only 20 minutes. But if it is raised in a bare tank, we will suck the remaining bait or feces out of the water by physical circulation.

suspended matter

Many fish friends buy nitrifying bacteria every week and add them on time according to the instructions. Is this right? But what I want to tell you is that you are doing the right thing, but your understanding of nitrifying bacteria is wrong. Because the so-called nitrobacteria we buy every week are actually photosynthetic bacteria.

photosynthetic bacteria

Photosynthetic bacteria, commonly known as B bacteria. Photosynthetic bacteria is a microorganism in water, because its photosynthetic pigments are pale pink, including bacterial chlorophyll and carotenoids. Photosynthetic bacteria can use the hydrogen in the compound to carry out photosynthesis without producing oxygen under anaerobic and light conditions.

Photosynthetic bacteria can survive in polluted environment and play an important role in purifying water quality. But only when the living environment and pollutants conform to their physiological and ecological characteristics will they play a role, otherwise it will be difficult to obtain expectations. For example, in the absence of light or oxygen, photosynthetic bacteria are difficult to play a role.

If there are photosynthetic bacteria in the aquarium, it will absorb and utilize substances such as organic matter or hydrogen sulfide, which will weaken aerobic heterotrophic microorganisms due to lack of nutrition, thus reducing the chance of toxic decomposition products, and purifying the water quality in the sediment, thus promoting the healthy growth of cultured aquarium organisms.

At present, the photosynthetic bacteria sold in the aquarium market are mainly Rhodosporidae, especially Rhodopseudomonas. This photosynthetic bacteria can effectively purify water quality in different metabolic ways under different environmental conditions. It should be noted that photosynthetic bacteria work best in the environment with water quality of ph8.2-8.6, so they are more suitable for use in seawater aquariums. So photosynthetic bacteria can only have a short-term effect, because there is no ideal environment for him to survive in our fish tank. Unless we make an anaerobic filtration zone and have lighting.