Hi, Hayleamorgan,
how's Bert doing today?
As the forum's pretty dead these days, you might try posting in the emergency forum, see if you can get hold of an expert there, which should be easier.
If you do, I hope you'll check back and let us know how it goes.
I know Athena recommended some type of antibiotic which worked really well on popeye in one of her fish - and I had the name written down in my notes (although the med. may not be available where I am, in Canada) and do you think I can remember it? Or find notes in the pile I'm sure they were stacked in?
(Of course it's after 3 AM here, which might explain a lot.
Not saying it does, lol, but I'll use it if I can.)
Maybe Athena, LauraFrog or someone else equally helpful will show up in the interrim.
Popeye can actually appear due to various causes, but infection is often a major suspect, although trauma can be as well.
I'm NOT an expert, but until one shows up, if you're not adding meds, a split dose of Melafix and Pimafix should act to help prevent infection/fungus if it is physical trauma, help with potential infections, and aid healing - and they're not toxic, although I don't generally give full med doses to potentially med-sensitive bettas, tetras/rasboras, cats/plecs...
And if there is any chance of injury being a cause, I'd be very reluctant to give massive water changes, unless he'll otherwise be left too long stewing in his own juice, so to speak.
What is WS3, if I may ask?
Is it an antibiotic?