[DAHansen]

I'll second (or is it third or fourth) the previous advice.

An additional thought:

If your Local Fish Store (LFS) encouraged, or did not try to dissuade you from buying the anemone, please ignore them in the future regarding the stocking of your aquarium. Particularly if they DID know that your tank was young. The only quick things that happen with marine aquariums are bad things.

I'm not trying to make you feel bad, I just want to make sure you know that it's inadvisable to put an anemone in a young tank. And that those who would advise you to do so should not be trusted.

Edit: PM me if you would like my "rules of thumb" for who to trust at the LFS.