Are fruit flies harmful to pet gerbils?

No, fruit flies are not harmful to pet gerbils. In fact, they can be a beneficial addition to their diet, providing them with a source of protein and moisture. However, it's important to note that fruit flies should be fed to gerbils in moderation and should not replace their regular diet of high-quality gerbil food. Additionally, it's essential to ensure that the fruit flies you're providing to your gerbils are free from any harmful chemicals or pesticides.