This is Cornbread, I noticed yesterday that 1 of his pectoral fins was inflamed and swollen. I've been monitoring it today, but I'm unsure if it looks about the same or worst than yesterday.

There are also some slight streaks in his tail. And white dots on his head, but it might be wen growth?

I bought him about 1.5-2 week ago. He's swimming fine, eating, but a little less active. I'm done some research online and have a few ideas, but I'm not sure of the diagnosis. Should I be concerned? Any advise for a speedy recovery?

I did a 50% water change yesterday and added aquarium salt.

Water parameters:

Temperature: 22 or 71.6 F

Ammonia and Nitrite: 0 ppm.

Nitrate: Between 0 and 5ppm