#2 looks like something I might have (from Duaine up in Ft. Sask), blue polyped acro. I'll take a picture tonight and you can compare it to the one you've shown and see if it's the same. I know I've given a couple pieces of it around here. I've got a piece I've been meaning to get into Canadian Man's tank. I keep forgetting to bring it to him.
#3 looks like a pink milli (Acropora millepora that is). I have some. Canadian Man has some and Kari should have a piece too since I gave him some a while ago ...
#4 is also some kind of A. millepora. I think.
#1 looks like that "deep water surharsoi" or something like that. Everyone seems crazy over them .... to be honest I don't understand the appeal. Maybe if I saw one in person I'd understand, but the pictures just look like a thin branched acro to me.