I have a neck cleaner on mine. It really cuts down on how often I have to clean out the skimmer. But when I do clean it out, it looks much like that first picture that showed......nasty!
I have a swabbie on mine and love it. I have always been a lazy reefer so I'm glad I don't have to worry about cleaning the skimmer so much. The swabbie is very nasty when I do clean it though.