Your lionfish is a bit out of place if you want to keep smaller fish
Also, basically nothing schools in SW except for a few cardinals, some anthias (debatable from species to species) and some micro dartfish. Outside of that, everything gets territorial and you end up with 1-2 big fish out of the pack.
What did you want the main focus of the tank to be? A few big showy fish? Predators? etc, etc