I've only got hitchhiker zoos, so those leaving wouldn't be an issue. I have a torch and a frogspawn, but mostly acros. I've read they can get nippy as they get older, but not terrible. I can live with nippy. Probably have to get rid of my clam though
I also read one thread where the angel ate all the aptasia. Cool. Also, if they like those purple clove polyps, I have a feast in my tank -lol