Unfortunately ich will remain in the tank forever as long as there are hosts. It doesn't effect most healthy fish that are established and you may never see the signs of ich again with your current occupants. It's a tough call but at this point I think you will be worrying every time you add a new fish to the tank. As a side note my shrimp always get just as much attention from people, if not more, than my fish and don't get ich. Good luck!
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