1. Check the water quality. Make sure the water is clean and free of toxins. Test the water for pH, ammonia, nitrite, and nitrate levels and adjust as needed.
2. Check the water temperature. Betta fish prefer water temperatures between 76-82 degrees Fahrenheit. If the water temperature is too high or too low, it can cause your betta fish to become stressed and lethargic.
3. Provide oxygen to the water. If the water is not getting enough oxygen, your betta fish may have difficulty breathing. You can add an air stone or bubbler to the tank to increase the oxygen levels.
4. Check for parasites or diseases. If your betta fish is barely breathing, it may be sick or have parasites. Look for any signs of illness, such as white spots on the body or fins, clamped fins, or popeye. Treat any illnesses or parasites according to the instructions on the medication.
5. Reduce stress. Stress can cause your betta fish to become sick and lethargic. Try to keep the environment around the tank as calm and stress-free as possible. Avoid making sudden noises or movements, and keep the tank away from bright lights.
6. Offer food. If your betta fish is not eating, it may not have the strength to swim to the surface of the tank to breathe. Try offering your betta fish small, easily digestible foods, such as brine shrimp or bloodworms.
If your betta fish is still barely breathing after trying these steps, you should take it to see a veterinarian.