Condylactis aren't host anemones, so there is no way of knowing whether the clown would choose to be hosted by that species. You asked if they can co-exist. There isn't likely going to be a problem having them in the same tank. I suppose it's possible the anemone could eat the fish, especially if the tomato clown is small. And yes, tomato clowns can be aggressive, primarily toward other species of clownfish.
