* Low calcium levels: Calcium is essential for bone and scale growth in fish. If the water is low in calcium, fish may start eating rocks to obtain the mineral.
* Low magnesium levels: Magnesium is another mineral essential for fish health. If the water is low in magnesium, fish may start eating rocks to obtain the mineral.
* Stress: Fish that are stressed may start eating rocks as a way to cope with their stress. Stress can be caused by various factors, such as poor water quality, overcrowding, or bullying from other fish.
If you see your fish eating rocks, it is essential to act immediately to identify and correct the underlying cause. Here are some things you can do:
* Test the water quality: Check the water quality of your fish tank to ensure it is suitable for your fish. This includes testing the pH, hardness, and mineral levels.
* Add calcium and magnesium supplements: If the water is low in calcium or magnesium, add supplements to increase the levels. Follow the instructions on the supplement package carefully.
* Reduce stress: If your fish stressed, do what you can to improve the environment in your fish tank. This may include reducing the number of fish, providing more hiding spots, or adding plants to the tank.
If you are unsure what is causing your fish to eat rocks, you should consult a veterinarian.