The filter in the video looks way too strong for him. I knocked my filter on accident, and it went faster than I adjusted to it. I go home, I find him stuck against the tube, unable to move. I would suggest you try buffering it (blocking it a little) with a sponge or something.
More plants as well, bettas love plants and hiding places! (Notice I say and, and not and/or. ;) )
And black doesn't mean sick, I'm pretty sure pale means sick, unless it's their natural color. Other than that, he looks quite fine.