Yep, I hear that also. You see how much quicker the little guy is to the big guy. So, if you have aggressive fish in your tank now, a smaller not quite as aggressive probably has a better chance. If you had big docile fish and added a small terror...
I don't care what anyone says female clownfish are pure evil. Although I adore my little female Ocellaris since she was my first ever SW fish and I will never get rid of her as long as I can keep fish.