Some folks use hot water, others use Kalkwasser solution applied the same way with a needle. Me I keep
peppermint shrimp for this =) The shrimp will eat a lot of stuff when the aiptasia are gone. Mine basically scavenge and bottom feed. I have yet to see them harm a coral.
BTW it's a hoot watching the Peppermint shrimp devour these guys.
Books....
http://www.thereeftank.com/books/
I like Bornemans coral book. The fish guide is also a good book should have that if ya plan on adding fish. And while I don't own them folks have spoken highly of the books by Delbeek and Sprung.
Mike