My chalk bass is my fav swimmer. He was my first fish and tolerated a lot of dumb mistakes like untreated tap water, temp swings, salinity fails etc.
My melanurus has been very hardy too, and def adds color and movement, but idk, I think he is going to be happier when I upgrade. A 55 is supposed to be enough but he just goes back and forth all day. It looks boring. Wrasses don't need pods like some fish, they just eat them if they are around.
My firefish are chill, they don't hide. They don't swim around much either, they sort of hover in the flow from a powerhead and glide across the tank once in a while. Really pretty fish though. Even the really cheap ones are awesome looking in person.
blue-green chromis were cool while they lasted, but they didn't last.
Note that when you say reef-safe it means that they won't eat coral, but you might want to consider your CUC as well. My melanurus assassinated all my snails, one day he flipped a switch and started eating them. I'm down to a conch, urchins and chitons plus an algae blenny. I got lucky in that he timed it for after my uglies had passed, I needed the snails more in the first couple months to eat my diff algae blooms so its nbd now.