1. The goldfish lies at the bottom of the tank may be because the water temperature drops and becomes too low. If the water temperature is very low, the goldfish will lose its vitality and appetite, thus lying at the bottom of the tank. In this case, the water temperature can be raised to above 20 C, and they can rest for a period of time until they recover.
2. Goldfish lying on the bottom of the tank may also be because they are sick. At this time, goldfish need to be treated in time to prevent the aggravation of the disease leading to death. They can be sent to a pet hospital for treatment.
3. Goldfish will not swim when they are born, and it usually takes 1-2 days before they can swim by themselves. If this is the case, they can be fed with cooked egg yolk after they begin to swim without special treatment.
the goldfish lies at the bottom of the tank or not depends on the specific situation. If they are tired, they will naturally get up and move after a rest. If the water temperature or water quality is not suitable, they can recover by themselves as long as the environment is adjusted. But if it's caused by illness, they can't heal themselves and need to be sent to a pet hospital for treatment.