I wouldn't ask Mr. Mosley about it. Like you said, you've got two hearts and in the long run, a small amount of negative reputation won't harm you. I'm almost certain that you'll have that and more in positive reputation by the end of the month ^^. Generally, it's not a good idea to contact an administrator about reputation, as they'll most likely say what I just did about getting more positive rep in the end. However, if it was a large amount of reputation lost (thirty or more points), or if the comment was absolutely gibberish, that may be cause to complain.