I hate to say this, but just because you don't see visible symptoms doesn't mean the fish don't have ich. The parasites are internal and they are there.
You could leave it alone and keep water clean and feed well and they may live long and prosper, or you could also wake up one day with a tank full of ichy/dead fish. Personally, I wouldn't take that risk.
No one ever said fishkeeping was easy. My one hippo tang showed ich last month and because of that I'm doing TTM and leaving my new DT fallow for 72 days. Of course I would have loved to put the fishes in the 8' tank, but I also want all my fish, current and future, to be completely healthy. Patience is a virtue, and for all the mistakes I've made in this hobby, losing more fish is not an option.
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