Here's why:
* Fish teeth are sharp: While they don't bite hard, their teeth can still cause scratches or irritation, especially if your finger is sensitive.
* Bacteria: Fish mouths contain bacteria, some of which could be harmful to humans. It's always best to avoid direct contact with their mouths.
* Stress for the fish: Being handled or touched can be stressful for goldfish. It can make them feel threatened and disrupt their natural behavior.
Instead of letting them nibble, focus on providing a safe and stimulating environment for your goldfish:
* Plenty of space: A larger tank is better for their well-being.
* Appropriate decor: Plants, rocks, and other safe decorations can provide mental stimulation and hiding places.
* Proper water quality: Keep the water clean and at the correct temperature.
* A varied diet: Feed them a balanced diet of high-quality goldfish food.
Enjoy watching your goldfish swim and explore their environment, but remember to keep your hands out of the tank!