I have a 45 gallon oceanic tech reef tank that has been up and running for about 4 months now. I have a pair of occelarus clowns the female is about 2.5 inches and is the largest fish in the tank. A small royal gramma, red banded high fin goby that I hardly see, skunk cleaner shrimp, and a candy cane pistol shrimp with assorted coral frags. I would like to add one more non aggressive reef safe fish that will not break the bank but unsure of which one. I was thinking maybe an fire fish or add pair but unsure. Any help would be awesome!