With Angels it is trial and error. It comes down to how much money and patience do you have? LPS and Zoo's are definitely off limits. SPS and softies is what I would try. GSP, Xenia, and mushrooms should be safe to start with, plus they will help with control of phosphates and nitrates. I have attached a picture of my old 158 with a young Red Sea Imp. that was safe with most corals but not with brains. I tried a Blue Face in this tank but he picked on my Frogspawn and Candy Cane.