I agree with what everyone else has already said. Anemones are one of the tougher salty critters to keep and some of them, like the carpet, can get truly HUGE :scared: It's advised that you get your tank up and running properly for at least a year or so before you even consider putting an anemone in.
So while you're getting that tank running well for about a year study up on them! Make notes on which ones are hardier, what they need to survive, and which ones what type of clown seem to prefer hosting. I.e., I believe it's the condylactus (bleh, spelling) that's one of the more hardy anemones but clowns don't usually like to host it (if I'm remembering correctly so check on that)