I have a 75 gallon reef aquarium, plenty of live rock, etc. but no coral and am not looking to go the route of coral. I currently have: 2 ocellaris anemonefish, 3 pajama cardinals, a sleeper goby, a yellow watchman goby, a fire goby (red firefish), a scooter blenny, 2 sand sifting starfish, 4 peppermint shrimp, 4 or 5 emerald crabs, about 20-25 total hermits (blue claw & zebras), and a few bumble bee snails.
I am looking for one fish. I want a nice blue color for the tank. The keys are they must be hearty, play nice with others
, and not outrageously expensive. Any help is appreciated in advance.