Murky or milky water in the aquarium – main causes of the problem

Murky or milky water in the aquarium – main causes of the problem

Having an aquarium, cloudy or milky water is a problem that is both quite bothersome and common. Why does this happen? What does milky or cloudy water in an aquarium mean? And most importantly, how to deal with such a situation? You will find answers to all these questions in our article!

Last updated: August 26, 2025

Why is the water in the aquariumMurky?

The aquarium aims to create conditions that are very similar to natural ones. This means that the bacterial flora in the home water tank must be appropriate, which will protect the fish living in it from protozoa or algae. For this reason, when buying a new aquarium, it is very important to wait a few days after filling it with water – this will allow microorganisms to develop that ensure environmental balance.water.

It's worth remembering: Regular monitoring of water parameters, such as pH, hardness, and ammonia levels, is crucial for the health of the aquarium.

What causes cloudy water in the aquarium?

Sometimes the water is not just cloudy, but reaches an intense, milky shade. This representsa clear signal that protozoa consuming oxygen have developed in it. Because of them, fish are at risk of suffocation and death.

Why did this happen? Why did dangerous protozoa appear in the aquarium? There can be quite a few reasons, and the most important ones include:

  • frequent feeding of the fish, and consequently their overfeeding;
  • inappropriate items in the aquarium (e.g., decorations or wood that is too fresh or poorly prepared);
  • inadequate water filtration (this may be due to an improperly cleaned or poorly selected aquarium filter, or in extreme cases, a complete lack of one);
  • immature aquarium (a consequence of introducing organisms into the water too early);
  • rare water changes intank;
  • lack of proper aeration in the aquarium;
  • poorly chosen substrate, which can result in the occurrence of decay processes.

Aquarium Filters

Cloudy water in the aquarium and home remedies to get rid of this troublesome problem? Of course, remembering the previously mentioned points.However, the most important thing is the right filter. Currently, high-quality filters from the brand Aqua Vita with reverse osmosis system are available at MojaWoda.com. If you are looking for professional aquarium equipment, you will find it in our store by visiting the " Filters forThe choice of the right filter should be adapted to the size of the aquarium and its fish stock. Filters with a reverse osmosis system are particularly recommended for those who want to achieve crystal clear water by eliminating harmful substances. It is worth remembering: The proper amount of food and regularCleaning the aquarium can significantly affect its condition.

Regular cleaning and maintenance of filters are crucial for their efficiency. It is also important to remember to replace filter cartridges according to the manufacturer's recommendations.

How to prevent cloudy water in the aquarium?

To avoid the problemmurky water, it is worth following a few rules. First, it is necessary to regularly change the water in the aquarium, which will help maintain the appropriate chemical parameters. Second, controlling the amount of food and avoiding overfeeding the fish is crucial for the health of the ecosystem in the tank. Third, ensuring proper filtration and aeration of the water can significantly affect water quality.

It is also worth regularly monitoring the conditionvegetation in the aquarium, as some species can affect water quality, both positively and negatively. Maintaining a balance between plants and fish is crucial for a healthy aquatic environment.

It's worth remembering: A well-chosen filter can significantly improve the water quality in the aquarium.

Ultimately, it's worth investing in the right accessories, such aswater testers that will help in the ongoing assessment of water quality in the aquarium.


Frequently Asked Questions (FAQ)

What are the most common causes of cloudy water in an aquarium?

The most common causes are overfeeding fish, improper filtration, and the presence of unsuitable items in the aquarium.

Is milky waterdangerous for fish?

Yes, cloudy water can lead to fish suffocation and death.

How often should you change the water in the aquarium?

It is recommended to change 10-20% of the water weekly.

What filters are best for an aquarium?

The best filters are those that are suited to the size of the aquarium and the type of fish.

What water tests are recommended for aquarists?

It is recommended to test pH, hardness, and ammonia levels.

Can plants in the aquarium affect water quality?

Yes, plants can both improve and worsen the water quality in the aquarium.

Author: MaciejWaliduda — a specialist at MojaWoda.com, an expert in aquaristics and aquatic environmental protection.

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