It is generally recommended to feed Siamese fighting fish once every 1 to 2 days. The amount of food for each feeding should be such that the fish can finish it within 5 minutes. This ensures that they get enough nutrition without overeating. If, for some reason, you can't feed them daily, Siamese fighting fish can tolerate being fed once every 3 to 4 days. Although this will cause a decrease in their activity level and a fading of their body color, they won't starve immediately.

The Breeding Environment and Food Choices for Siamese Fighting Fish
Siamese fighting fish don't have high requirements for their environment. The suitable water temperature is between 26°C and 28°C. Avoid direct sunlight to reduce the growth of green algae. You can place some small Anubias plants in the fish tank to increase its aesthetic appeal. As for the food of Siamese fighting fish, you can choose special fish feed, brine shrimp, tubifex worms, water fleas and other animal-based feeds. These foods are beneficial for the fish's color development and health. In addition, mosquito larvae are also a favorite food of Siamese fighting fish, which can stimulate their hunting instincts.
By maintaining a reasonable feeding frequency and providing an appropriate amount of food, you can ensure that Siamese fighting fish remain healthy and highly ornamental.