hi john,
If you don't see any disease or change in behavior then personally, I do not see what you have to worry about. Of course, you describe can be charastic of ich.
Are you feeding any vitamins with you food.
All in all, if your fish are healthy and no change in behavior then i would not worry to much.
of course, keep a close eye on them if it does happen to be ich or somethign else then you can treat accordingly
Best,
HB