Hey,
My answer is "yes". Others will disagree. With a lot of lr and a dsb you can run without a mechanical filter but I believe in a skimmer. A neat thing I saw here a while back was putting the skimmer on a timer with your lights and just skimming at night. That way your skimmer doesn't skim out any additives you put in until they've had a chance to work. Just my .02. Years from now people will be laughing at the way we run tanks, just like we giggle at UGF.
Dan'l