Is your tank 72" x 24" x 21" ? 155 is kind of an odd volume, so I'm not sure how big it is.
Your tank may end up being a bit tight for the Arothron (puffer) once it grows, altho the foxface should be fine. Also, once my Arothron got a bit of size on it, it became nippy to the point that I had to get rid of it, so bear that in mind when choosing tankmates. Sailfins also get pretty large, so in a way, one COULD say you're maxed out.
You also have fishes that tend to be rather messy eaters/poopers, so that's another consideration. Do you run a sump?
Which fishes are catching your eye?