Sixline Wrasses are pretty cool. As are Longnose Hawkfish, Zebra Dartfish, and Midas Blennies. All reef safe (My Hawkfish hasn't gone near ANYTHING) and can go in a 55. Hope this helps! I would recommend looking them all up in google images or something.
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