How long

are your ammonia levels up? if not you can add fish but only add 1 or two every couple weeks at least a week apart from each other unless you are adding a pair of something
 
three to 4 weeks will kill all the parisites but if you dont qt any of your new fish for at least three weeks in hyposlanity or copper you will run the risk of ich getting back in the main tank and killing everything again
 
BJ is right. If you have fish in the tank, you still have ich. And waiting to add new fish won't do any good, as the new fish will just get it from the old fish. In order to eliminate ich from your tank, you need to remove ALL fish and leave it empty of all fish for 8 weeks.
 
Then you won't be able to get rid of the ich in the tank. Ich needs a fish host to survive, and as long as it has a fish host, it will be present in your tank.
 
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