Some people have issues getting their harlequins to eat already dead/frozen stars also, so that needs to be kept in mind. They are definitely NOT a beginner or even medium level invert. Need to make sure you can afford to buy them a star a week or so.
They are awesome animals but the feeding requirements is what keeps me from getting any, and I love unique inverts far more than fish and coral, lol. I hate seeing people think they are just fancy pest control. I bet a huge number of them die because of that.