| The medicine for internal parasites for fish is called Pipzine, or Hex-A-Mit.
It's toxic to inverts, so you either need to feed the medication soaked food extremely carefully (one piece at a time to make sure that no pieces escape and get picked up by an invert), or you remove all you fish (if one has it, it's more than likely that all your fish do), quarantine them. In Quarantine, you can either dose the water as per the directions, except for at LEAST 6 weeks (the four weeks on the box is not adequate, and the tank has to be left empty of hosts for at least this long), or feed as described above, without the need to be careful.
Not every LFS carries these medications.
Do any of your afflicted fish have a slight thickening between their belly and anus? This can also be a sign of parasites, as the parasite grows and the fish get thinner.
Good luck with this.
Alexis
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