maybe, maybe not. You cant garantee anything reef runt. Give it time, a day isnt long at all and your lucky the male went in to it so quickly.
Is the nem a M doreensis ?
Have you researched the anemone and what they require? How old is the tank ? How deep is your sand bed and what lights do you have over the tank ? Have you covered all filter intakes to stop the anemone from being sucked in to them ?