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You can treat this parasite with salt, a little heat and an aggressive water change routine that includes careful vacuuming of the bottom material. Avoid putting chemicals, other than the standard water treatment into the water. You don't know how your fish and plants will react. A couple of healthy teaspoons of standard aquarium salt added to every 5 gallons of your replacement water is needed. This is enough to retard the growth of future generations of the Ich parasite, so there's little or no reproduction. Raise the water temperature to 80 degrees. This is enough to shorten the lifespan of the parasite and not damage aquatic plants. Do a good job of vacuuming the bottom material. There will be some parasites there. Change most of the tank water every 2 to 3 days and feed the fish just a little when you change the water. You don't want uneaten food to mess up the tank water any further and sickly fish aren’t likely to want to eat much.
You can stay with these steps as long as it takes the fish to recover. Once the parasite is gone, return the tank to routine settings and change most of the tank water weekly for the life of the tank. Keep it simple and there's fewer things you have to remember to do.
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