Firefish almost invariably have worms, it seems, and there are numerous pictures available of these fish with the worms sticking out of them. The good news is that it takes a very long time for them to die from them, so you have plenty of time to eliminate them.
Flubenol or Levamisole or Concurat or Piperazine or Praziquantel are all good for roundworms, although naturally the most effective ones are the ones which are the biggest pain to use. I'd try Prazi-Pro first since it's so relatively cheap & easy to get & use. If you're lucky enough to have a vet who knows how to deworm fish, you can get the better drugs & instructions on their use from the vet.
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