I am not really familiar with the RR94, so I will only say fish that can live in smallish aquariums. They are all also reef-safe.
Blue-Green or Blue-Reef Chromis (both need to be in groups of at least 3)
I can add more if you say how big the tank is and if you are going to go reef
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