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Bubbles can form in the tank for different reasons. Some are harmless, but others can be fatal. Because of this, not only freshwater fish but also people who grow sea fish are at a loss. Bubble problems can be solved relatively quickly if processed quickly and do not have a detrimental effect on ornamental fish.

When is normal bubble formation in the tank?

Bubbles can be seen in the water in the tank. This is a natural water tank environment. The air stones that the air filter sets up to help create bubbles and help the water flow through the water tank create small bubbles. Hanging filters can also cause air bubbles. It is normal for bubbles to form temporarily after making a tank. The bubbles generated at this time do not cover the entire water in the tank.

On the other hand, there are species that make nests. Healthy Betana and Kurami entice females with their nests. The hemispherical bubble nest created by these fish floats on the water tank. It is also attached to plants in the aquarium. Sometimes foreign matter is mixed with bubble nests, which is a perfectly normal reaction.

Causes of bubble formation in the tank


It is easy to bubble if you poke through the tank. And it is normal reaction to get a little bubbles when we go to water of the tank, and it is not harmful. If you want to avoid air bubbles when filling a water tank, you can get a clean plate and tilt it into the water tank and slowly pour water over it.


No matter how small the soap or detergent enters the tank, bubbles can form. These types of bubbles are toxic, and the aquarium fish may die if they are not immediately replaced by another tank. After removing the water, you should rinse everything that has been installed in the tank to remove the soot. You also need to clean the filter and replace the filter media and pad.

One of the reasons why soaps enter the water tank is due to cleaning tools such as buckets or scrubbers that pour water for water. These items should not be used for purposes other than washing the tank. When water bucket is used for washing, it may be contaminated with soapy water and the ornamental fish may die. Therefore, waterproofing products should be labeled and should not be used for other uses.

It should be noted that bubbles can be fatal to ornamental fish if they are caused by soap or detergents. Minor detergent residues can have a profound effect on the ornamental fish.


Protein bubbles are common in seawater tanks, but they can also occur in freshwater tanks. Protein bubbles are made into giant forms that stick together as small bubbles of protein are deposited. A seawater tank uses a device to remove these proteins. However, the protein removal device is not effective in a seawater tank.

The accumulation of proteins and bubbles mean that there is no direct impact on the ornamental fish, but there may be other problems with the aquarium. Proteins accumulate when there is a large amount of organic deposits in the water bath. This occurs when food is overpowered or water is not replaced on time.

If there is a protein bubble in the tank, it means that the tank must be cleaned. In other words, the filter must be cleaned and the residue removed. You should also check the status and number of the ornamental fish. There may be dead ornamental fish behind plants or rocks. Dead ornamental fish are also protein sources, which can be a major cause of protein bubble formation.

Regular water changes, filter management, and tank cleaning can solve the protein bubble problem. You should also check the state of the ornamental fish daily.

What can you do?

The most important way to keep the tank healthy is to fill it with good quality water. Chlorine can damage the tank in a matter of minutes. Tap water is treated with chlorine or chloramine, which can be dangerous to ornamental fish. Ornamental fish that are poisoned by chlorine can be reddish or covered with mucus as a whole. Therefore, if you do not remove it immediately after exposure to chlorine, you will usually die.

The ornamental fish require oxygen to survive. However, if hydrogen accumulates toxic chemicals such as chlorine and ammonia, the ornamental fish will climb onto the surface to produce oxygen, which produces bubbles. This is a sign that ornamental fish are in danger. So if you see this behavior of the aquarium fish, you should check the tank condition and replace the ventilation system as soon as possible.

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