#1 is poccilapora, I have the same one. I believe Walt Smith distributes this variety. It requires a lot of light to keep the
pink color. The areas that are in lower light should turn Blue Green.
2, and 3 I am not sure
#4 is super blurred, but looks to be a Millipora of some sort.
From the pics on the Walt Smith site it looks like they call it the
Fancy Acropora, which is no help
If you bought these at the same time there is a good chance they
are all from there.
http://www.waltsmith.com/products/hard_corals.html