The main solutions to the turbid water for goldfish include the following:

Strengthen the Filtration System:
The filtration system is a key device for keeping the water quality clear. Select an appropriate filter, such as an external filter, which can more efficiently deal with the impurities in the fish tank. Clean the filter regularly to maintain its good working condition and avoid the accumulation of impurities.
Change the Water Regularly:
Regularly replacing part of the water source is a basic measure to keep the water quality clear. Generally speaking, it is more appropriate to replace 10% to 25% of the total water volume of the fish tank every week. When changing the water, pay attention to making the temperature of the new water similar to that of the water in the fish tank to avoid adverse effects on the fish due to a large temperature difference.
Control the Feeding Amount:
Overfeeding will lead to an increase in the excreta of the fish, thus aggravating the pollution of the water quality. Reasonably control the feeding amount according to the type, size and number of the fish. Feed the fish one or two times a day, and the amount each time should be such that the fish can finish eating within 5 minutes.
Use Water Clarifiers:
Adding water clarifiers to the water can quickly improve the problem of turbid water quality, but pay attention to the correct usage methods and precautions.
Treat Sick Fish:
Sick fish will secrete mucus or shed scales. It is recommended to treat the sick fish separately to prevent the spread of pathogens.
Re-establish the Nitrification System:
Replace part of the water with new water and add nitrifying bacteria to help establish and maintain a good ecological nitrification system.
The main reasons for the turbid water for goldfish include:
Physical Turbidity:
There are too many suspended substances in the water, such as leftover feed, fish excrement, and scales shed from the fish body.
Chemical Turbidity:
The content of chemical substances in the water is too high, such as ammonia nitrogen, nitrite, nitrate, etc. These substances are usually waste products produced by the metabolism of fish.
Biological Turbidity:
The microorganisms in the water multiply excessively, forming flocs or colonies, making the water quality turbid.
Suggestions for Preventing Turbid Water for Goldfish:
Clean the Filter Cotton Regularly:
Keep the filtration system clean and efficient.
Control the Stocking Density:
Don't put too many fish in the fish tank to avoid overloading the water body.
Use High-quality Feed:
Select easily digestible and good-quality feed to reduce the generation of waste.
Avoid Overfeeding:
Feed regularly and in appropriate amounts to avoid waste and increasing the burden on the water quality.