OK, sorry, I updated my profile. The betta died, you are right he didn't seem to like having the other fish in his space, also got niped a bit by the tetras (gave them away).
My ammonia and nitrite is 0 since the tank is old, my nitrates were a bit high though like 50-80. I hadn't realized it since apparently I wasn't shaking the bottle in the
test kit enough (thanks fishlore members for that). I've been doing a lot of water changes since the glancing started so it is better now, and cut down the number of fish.
I am using salt because it's the only thing i can think to do before i get a proper diagnosis.
Now my favorite molly is glancing, it's spreading

. No spots, no specs, no worms though that I can see. If it is velvet it would be really hard for me to detect since all of my fish has at least some gold on them. Even my dalmation/black mollys lol. Doesn't help that I wouldn't know what to look for either.
what I was considering doing was removing all my rocks and decorations from my tank while I am treating it.