Help with Betta, updated video

This is an updated video of my new Betta. Less than a week in this tank. Not feeding well. At first I thought it was because we were just figuring eachother out but now even when presented right in front he may nibble but not actively feed.

You can see my recent post for parameters and tank set up, nothing there is screaming red flag. He was so fired up and aggressive when I got him, in comparison he seems lethargic but maybe he's just relaxing in his new digs. Still my Spidey senses are tingling that he's not thriving. Some help would be appreciated if you see something I don't see