stocking tank with corals...

[fishface]

so as a newb here i've been looking to stock my 25g tank with some corals. at the moment i've got pipe organ and xenia's only for corals but looking through shimek's marine invertebrates book, seems like almost all coral are aggressive. so how do i stock my tank or are they "potentially" aggressive? whats a guy do for options?

thanks for any help

darryl