Help! Can anyone tell me the names of these corals?

the first picture is an acan, 2nd looks like pocillipora, and 3rd looks like green star polyp, no opinion on 4th
 
Do you have any pictures without the actinic lights on? Its hard to say what they are with the pictures being so saturated with blue.
But I would agree the first coral is an Acan, is the second one a stony or soft coral?, the third one might be GSP as optionman mentioned or if its a stony it could be lephastrea or hydnophora, and the last one looks like gorgonian (sea whip)

If you get better pictures though it would help a lot
 
4th is some kind of Gorgonian that I hope you researched and made sure was not a non-photosynthetic one prior to buying it. 3rd looks like a Pavona or hydno of some kind.
 
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