Hello- your betta is gorgeous btw!
I think 8 pellets twice a day is a bit much. Their stomachs are approximately the size of their eyeball. I would recommend lowering the amount of pellets per serving to 2-4. Tons of people will recommend fasting your betta once a week, as well.
Platys, Tetras, Mollies, Bettas, BN Plecos
Red Eared Slider