The main reasons why goldfish lie at the bottom of the tank include the following:
Water Quality Issues: Goldfish are highly sensitive to water quality. Deterioration of water quality, high ammonia - nitrogen content, insufficient dissolved oxygen, or unstable pH values can all cause goldfish to lie at the bottom of the tank. Regular water changes, maintaining a good filtration system, and using a water conditioner to regulate the water quality are effective solutions.
Unsuitable Water Temperature: Goldfish are very sensitive to changes in water temperature. Water that is either too hot or too cold can make them uncomfortable. The suitable water temperature range is 18 - 26°C. In winter, a heating rod is needed to maintain the water temperature.
Oxygen Deficiency: Insufficient oxygen in the water can cause goldfish to lie at the bottom. Installing an air pump and increasing surface agitation to promote gas exchange can ensure that goldfish get enough oxygen.
Disease Problems: Goldfish may suffer from enteritis, white spot disease, gill rot, etc. These diseases can cause goldfish to lie at the bottom. Timely observation and treatment, choosing the appropriate medicine, and improving the breeding conditions are necessary.
New Environment Adaptation Period: Newly arrived goldfish may need time to adapt to the new environment. Place the goldfish in a relatively dark environment to rest quietly, avoid disturbing them, and give them time to get used to their new home.
Dietary Issues: Overfeeding or feeding with stale food can affect the health of goldfish. Ensure that an appropriate amount of high - quality fish food is provided and avoid overfeeding.
Lack of Nutrition: If goldfish do not obtain enough nutrients, they may feel weak and sickly. Observe the goldfish's diet to ensure they get enough high - quality fish food.
Stress Response: Goldfish may experience a stress response when frightened or hit by external forces. Lying at the bottom of the tank is a self - protective behavior. Keeping the environment comfortable and reducing the occurrence of stress responses is the key to solving the problem.
Preventive Measures: Regularly checking the water quality, maintaining an appropriate water temperature and dissolved oxygen level, feeding rationally, and providing a quiet and comfortable environment can effectively prevent goldfish from lying at the bottom of the tank.