29 biocube stocking help

Hi, I have a coralife 29 biocube. I have 2 fish rn an ocellaris clownfish and a matted filefish. I'm looking for a smaller fish that's pretty colorful and active (not hide when I walk into the room). I also have some soft corals, so I need a reef friendly fish. I was thinking of a royal gramma.

And what's a good clean up crew? I have a coral banded shrimp (mine is not aggressive at all), an emerald crab(that hides all day :( ) and 2 small hermits. I want to get a nassarius snail soon. I love little critters, and I know that a clean up crew won't take much bio load. :) any good suggestions that are entertaining to watch?


Thanks!