firefish compatibility

I'm looking to add a new recruit to the tank since my skunk cleaner bit the bullet that or someone bit him! Anyways the concern is compatibility for my firefish and space in the rockwork since my gramma and firefish have established themselves on either side of the tank. I wnat a colorful fish that will stay in the water column and not get harassed by my pair of clowns who think they own the place. I know a damsel will bring color but I also know he will take over once he goes in. Any ideas?

What size tank? Reef safe?

just a 46 gallon and yes reef safe have 2 0 clowns, royal gramma, and firefish for verts and just beginning the corals with mostly lps and zoas