Clowns, chromis, and gobies are good for that, they're pretty hardy and are all reef safe. Of course, no fish is really "ich resistant", but these ones aren't ich magnets like some others.
I have 2 clowns, a royal gramma, a neon goby, blue hippo tang, and a blue/green chromis currently, though I've got a big stocklist of what's going to be added....
yellow tang, mimic tang, some sort of fairy wrasse, 3 anthias, and eventually (after the tank and fuge are mature) a mandarin.