I have a pair of fire fish. They stay right in the front of the tank. The wrasses are nice. The Royal Gramma is purple and yellow, pajama cardinalfish are nice, but love shrimp if you have any.
if your go to liveaquaria.com they have pictures of the fish, compatibilty charts, size requirements and feeding infor. Some are reef safe others are not. They will tell you.
Some fish like the mandarins are nice looking but they require special feeding most times. The yellow watchman goby has personality, but can eat small shrimp.
hope you find something you like...Not too big for that size tank.
Tom
Oceanguy