Malachite green is a good overall fungus killer, not such a good parasite killer. It will take alot of time to treat using just the malachite green.
What kind of fish are you treating?
My advice is to start raising your temperture in your tank to 86-87F over the course of a few hours (a degree an hour). Leave it there until you see no more ich, and then leave it there for atleast a week, but preferably two weeks after that. That will rid your tank of ich. Dose the malachite green as reccomended. Keep your lights off during treatment as well, except to observe the fish. Malachite green is slightly deactivated by light.
You'll want to do regular water changes during treatment as well to remove the dead parasites, and keep good water quality.
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-Lindsay
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