Unfortunately my acans are my favorite. My dream system would have massive acan gardens, and damaging them is a no-go. I'm assuming that mostly rules out angels and butterflies?I think if you like Acan, Lobophyllia and the like, you are out of luck with Regal. Catalaphyllia, Euphyllia, Gontopora and Alveopora are Ok with most angels. My angels mow down the Xenia that I put in the tank.
Regal angel grow pretty slowly and will be fine in a 120 or 150. Fox Face, even the smallest Foxface Lo get pretty big quickly and IME get too big of a 120 gal. PBT is one of the larger tangs, but should do OK in a 120 gal. This is kinda pushing it for PBT.
You may want to consider a CBB