What fish do you have? I have 3 peppermints in my 90 gallon that almost never come out, but they were relatively social before I got a hawkfish. The hawkfish never terrorizes them (he even lets the cleaner shrimp on him to pick off parasites!) but I think they are scared of them.
90 Gallon Reef - 3 Blue-Green Chromis, 2 Ocellaris Clowns, 1 Kole Tang, 1 Midas Blenny, 1 Longnose Hawkfish, 1 Zebra Dartfish, 1 Algae Blenny, 1 Six-Line Wrasse
29 Biocube Reef - 1 Chalk Bass, 2 Black and White Clownfish, 1 Yellow Watchman Goby, 1 Fire Goby