Common reasons include:
- Lack of Oxygen: Overcrowding, dirty water, poor aeration.
- Temperature: Water too warm.
- Disease or Stress: Parasites, infections, poor quality.
- Seeking Food: Anticipating feeding.
What to Do
- Test water quality.
- Ensure proper aeration.
- Adjust temperature.
- Watch for illness signs.
- Consult an aquatic vet if needed.