There really is no difference between Forums and Gallery for any specific area so a Coordinator or Moderator is responsible for both the Gallery and associated Forum.  However different sections like Poser, Daz/Studio, Bryce etc. are more active in their Forum than most others so there are many more coordinators for those Groups. Coordinators assist the Moderator of the Group in overseeing the Gallery Contests and Forum. they also have options to move, delete, modify posts in the Galleries and Forum after a review of the questioned posting is brought to the Coordinators Forum for discussion. Moderators have even more accesses, it's their job to oversee the Coordinators, Gallery, Forum, to generate Forum threads of interest to that particular group, generate and manage Contests, Challenges, Change Banners all that good stuff.  Fractals is pretty easy to oversee, Fractaliers are pretty easy going people, not much need to worry about Images with Nudity, Violence or Sexual Content, you don't get a lot of advertising linking on images or fights in the forum over how to do things with the software.

Remember...No matter where you go there you are