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Try a small piece of frozen pea unthawed. I had a betta that refused to eat for anything but pea for several weeks. He was probably constipated looking back on it and the pea helped get things moving. I stay away from freeze dried food because it can cause constipation. Some pellet food is incased with plastics so I am picky about the pellet food I feed.
The reason he might be lighter in color is because of stress. Look and see if there is something that is stressing him out at the side where he is flaring, it could be something as silly as a ared ink pen to close to his tank. I bought what I thought was a nice peach colored betta but actually after it got in a bigger bowl it started to turn to a dark chocolate color. I put my bettas in a bowl for a few weeks so I can keep a close eye on them and can treat them easier after that they go in a cycled planted tank.
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