Why is the water in the fish tank yellow after one month of use? Do I need to change the water regularly when raising goldfish?

In the process of fish farming, we often say: raise the water first before raising fish, that is to say, the water used for fish farming must be well maintained before raising fish. Fish live in water, and it is very difficult to raise fish well if the water environment is not good. As you said, the fish tank has been opened for a month, but the water is still yellow. What should I do?

Why is the water in the fish tank yellow after one month of use?

The water is too dirty: There are several reasons for this. One is that the filter of the fish tank is too dirty, and the nitrifying bacteria in the water cannot decompose these impurities in time, making the water too dirty; another is that the nitrification system in the water is not stable yet. Because the nitrification system is unstable, the number of probiotics in the water is limited and cannot decompose the organic matter in the water in time; another is that there are too many organic matter in the water, and because the probiotics cannot decompose it in time, the algae in the water multiply and the water turns yellow.

Medication: That is, when you first put the fish in, you used drugs such as yellow powder to make the water turn yellow. At this time, the water quality appears yellow due to the drugs. This has little impact on this situation. After changing the water several times, the water will slowly turn clear.

Other factors: For example, many friends now like to put some driftwood in the fish tank as decorations. These woods usually slowly release something that makes the water turn yellow.

Under normal circumstances, the first factor is the most common reason for the yellowing of water. For water that is too dirty, the water quality can be improved by maintaining the filtration system and adding probiotics to the filtration. At the same time, reduce the amount of fish fed on a regular basis to reduce the amount of organic matter in the water. Generally speaking, as long as there is no problem with the filtration system itself, the water quality will gradually become clear after the filtration is well maintained.

Do I need to change the water regularly for goldfish?

How often should you change the water? This depends on factors such as temperature, water quality, and fish density. Under normal circumstances, when the water temperature is above 25 degrees, change the water 2-3 times a week. When the water temperature is between 10-25 degrees, change the water 1-2 times a week. When the water temperature is below 10 degrees, change the water once a week or even once every 10 days. In short, the higher the water temperature and the more you feed, the more water you need to change and the less water you need to change.

Of course, this is not fixed. If the water quality becomes turbid or deteriorates, or after using medicine, you must change the water in time. In addition, sometimes we cannot rely solely on changing water to solve water quality problems. When necessary, we still have to maintain the filtration, which will also reduce the number and amount of water changes.

How many koi should be kept in a pond with 75 tons of water?

The minimum standard for growing koi into big fish is one koi per ton of water. As long as it is not lower than this standard, it is suitable.

The total water volume of your pond is 75 tons, and you can raise a maximum of 75 koi. As long as it does not exceed 75, you can raise the koi well and grow them big.

And the most important point is that you didn't say how big the filtration of the fish pond is. The above recommendation of no more than 525 is based on the premise of having a powerful filtration system.

If your pond does not have a filtration system at all, the standard will have to change. Four or five tons of water are needed to support one koi. Your pond can only support less than 15.