My emp is in a 210. I don't have corals in that tank at this time. I QT'd him in a 55 gallon reef several years ago when I first got him. (Lets you know where the corals come in on my priority list.
) As a changing subadult, the emp ate every single zoanthid in the tank - probably well over 200 polyps. It didn't bother any leathers, Turbinaria, gorgonian or mushrooms. (The dogface puffer ate all the mushrooms.)
Gary, your tank is gorgeous! Do you still have that set-up? In your opinion, is your emp okay in that tank for life? Not to hijack, but if you still have that tank going, what are the tankmates with Junior? I'd be willing to devote my 210 almost exclusively to my emperor (Elvis).
Here are a couple old pics (sorry, I'm no photographer):