I would continue the treatment.
It may also be desirable to treat with copper, but if you do this, you'll need the med and a test kit. I would treat with copper and hyposalinity.
What happens is that the parasites you see are not the important ones. The problem ones are the parasites that get into the gills. They grow there and choke the fish.
Of course, putting them back in the main tank will not solve anything. You need to let the disease run it's course there also.
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