Acans and blasto's is mainly what i hear large angels going after.
Lobo's, favia, micromussa would be considered more of a risk like the above i mentioned.
The meaty type lps corals is what they will have a greater risk with.
Torch, frogspawn, hammers and platecorals are pretty safe because they are more noxious. But nothings 100 % safe.
I have heard of them going after millies and hairl polyp sps.
You get them liking your prepaired foods and keep some sponge in there to naw on and they will preffere the sponge.
Atleast mine does. Every so ofter it will inspect the orange finger sponge and take a nip.