When we have to change the water for our fish, we often make a very common mistake: we change the water without taking into account the chemical composition of the water we are adding to the aquarium. Many times, tap water contains chlorine, a disinfectant used to ensure the potability of water for human consumption, but which can be lethal to fish. In this article, we will explain in detail why chlorine is so dangerous for fish and how to ensure a healthy environment for them.
Why is chlorine harmful to fish?
El chlorine is a chemical compound widely used in the treatment of drinking water due to its ability to eliminate bacteria, germs and other harmful microorganisms. However, this same compound can be devastating to fish. When introduced into aquarium water, chlorine It damages the mucous membranes and gills of fish, interfering with their ability to obtain oxygen from the water. This can cause severe stress, illness and even death of the fish.
Furthermore, it is important to understand that the chlorine Not only does this affect the fish directly. It also eliminates the beneficial bacteria that inhabit the aquarium's biological filter, unbalancing the internal ecosystem. Nitrifying bacteria are essential for the decomposition of organic waste and the conversion of ammonia into less toxic compounds such as nitrites and nitrates. Without these bacteria, the levels of ammonia will drop. ammonia can increase rapidly, endangering fish.
Tap water and its components
Tap water may contain various components in addition to water. chlorine, such as the chloramine (a combination of chlorine and ammonia), fluoride and heavy metals. Although these compounds are safe for human consumption in controlled concentrations, they can be highly harmful to fish.
Chloramine: Unlike chlorine, chloramine It does not evaporate easily even if we let the water sit for days. Therefore, its removal requires the use of specific products such as conditioners.
Heavy metals: Lead, copper and zinc present in tap water can accumulate in the bodies of fish, weakening them and making them more susceptible to disease.
How to treat tap water before using it in the aquarium?
It is essential to condition the water before introducing it into the aquarium. Below we offer you several tips methods to remove the chlorine and other harmful compounds:
- Use of conditioners: Water conditioners are liquid products that neutralize the chlorine, chloramines and heavy metals present in tap water. This method is fast, efficient and ensures safe water for your fish. In addition, many conditioners include beneficial elements such as mucous membrane protectors and vitamins.
- Water rest: A traditional practice is to let the water sit for 24-48 hours to allow the chlorine evaporate naturally. However, this method does not eliminate chloramines nor heavy metals, making it less effective than using conditioners.
- Activated carbon: Filters activated carbon They eliminate not only the chlorine, but also chloramines, heavy metals and other contaminants. It is an efficient solution for larger aquariums.
- Boil the water: Boiling water can remove the chlorine in a matter of minutes, but it is not practical for large aquariums due to the volume of water required.
Good practices when performing water changes
Performing proper water changes is crucial to maintaining a healthy aquarium. Here are some tips recommendations:
Partial changes: Instead of changing all the water in the aquarium, perform partial changes of 15% to 25% of the total volume. This minimizes the impact on the ecosystem.
Never change the water directly: Although the temptation to change the water quickly may be great, never pour untreated water directly into the aquarium. This can cause fatal chemical shock for your fish.
Use an exclusive cube: Use a bucket intended only for the aquarium, making sure that it has not been in contact with detergents or other chemicals.
Signs of chlorine poisoning and how to act
If you suspect your fish have been exposed to chlorine, pay attention to these signs:
- Lethargic behavior.
- Rapid movements of the gills.
- Sudden discoloration.
- Erratic swimming or difficulty maintaining balance.
In these cases, act quickly:
- Remove affected fish and place them in a quarantine tank with treated water.
- Perform a partial water change in the main aquarium, using previously conditioned water.
- Add a water conditioner and monitor water quality using a test kit.
The importance of a balanced ecosystem
An aquarium is not just a tank with water and fish; it is a miniature ecosystem that requires proper balance to thrive. Water quality is one of the most critical factors. In addition to the chlorine, other pollutants such as ammonia, nitrites and nitrates can accumulate if proper maintenance practices are not maintained.
An efficient filtration system, a controlled population de peces and the removal of food debris and organic matter are essential to avoid long-term problems.
Remember that the health of your fish depends directly on your care. With a little effort and attention, you can provide them with a safe and healthy environment.