Does this look/sound like flukes?

[jassz]

I have a FOWLR tank, no coral. There's a few hermit crabs, maybe, but that's it.

Now that the fish is already in the main tank, wouldn't I have to treat everyone?

My previous experiences quarantining were not good. I had to remove almost all the rocks to catch, and in one instance the stress was so much that he was dead by morning (and he hadn't even been THAT sick). The other QT fish also died, though not as quickly.

Where did you get the white worms? I don't recall seeing thme in fish stores.

Thanks for the tip on the medicine. I will look for it.