Hi, and sorry to hear your fish is sick, although its a little difficult to tell what the problem is on the video.
I'm not a mod, so I can't help you on your fish, but even though your water params are ok, they are going to need you to answer all of the questions in the above box in order to help you better. The more info they have, the better they can try to figure out what the problem is.
Nice tropical tank, btw.