Why is your female betta fish getting fat been with any male fish?

There are several reasons why your female betta fish may be getting fat. Here are a few possibilities:

Overfeeding: Betta fish are prone to overeating, and if they are given too much food, they can quickly become overweight. The best way to avoid overfeeding your betta is to feed it only once or twice a day, and only give it a small amount of food each time.

Lack of exercise: Betta fish are also very active fish, and they need plenty of exercise to stay healthy. If your betta is not getting enough exercise, it may become overweight. To encourage your betta to exercise, you can provide it with a larger tank, add some plants or decorations for it to swim around, and play with it using a ping pong ball or other small toy.

Genetics: Some betta fish are simply more likely to become overweight than others. If your betta is from a line of overweight fish, it may be more difficult for it to maintain a healthy weight.

Underlying health problems: In some cases, a betta fish may gain weight due to an underlying health problem, such as a thyroid issue or a tumor. If you are concerned that your betta may have a health problem, you should take it to a veterinarian for diagnosis and treatment.

If you are not sure why your female betta fish is getting fat, it is best to consult with a veterinarian. They can help you determine the cause of the weight gain and recommend the best course of action.

As for whether your betta has been with any male fish, this is not a factor in weight gain. Betta fish are typically solitary creatures and should not be kept together with other fish, as they can become aggressive.