Okay, that puts my mind at ease a little. In my mad dash to quickly fix the problem, I placed the 5 harlies in a quarantine tank with a 2tsp per gallon salt solution. They were in there for, oh, I'd say 20 minutes. I put them back in the large tank, and the biggest white speck on the fish seems to have gone away. I'll still be doing a full ICH treatment, though. The news that the tank at the LFS which the fish came from came down with ICH is disconcerting enough for me to do the full treatment.
Newbie, thanks, again, and again and again, for your help! You're the best.