Good job.
The addition of the new plants probably led to this problem.
The bigger problem is that all the treatments for these ailments are very bad for plants, so you'll have to treat in a hospital tank, which might be fine for the fish, but does nothing about the beasties still in the main tank. Raising the temp to about 30c while the fish are gone and adding just a little salt or acriflavine will stress the plants, but they 'll probably survive better than the parasites. Continue for about a week, then change 1/2 the water, making sure to do a good cleanup of the gravel and decor in the process. Discontinue carbon filtration during treatment. after it's all fixed, let it run for a day to stabilize and return to normal temperature before returning the fish.
From then on, quarantine the plants just like you would any new fish. Since plants are so sensitive to the treatments, they are typically not treated for anything before being sold.
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