Oh boy. To skim or not to skim......
This hobby reminds me of another hobby I enjoy. Archery. No two ppl have the same setup and EVERYONE has an opinion on what is needed to do it right.......
But that's half the fun of it.
Anyway, I empty a cup of absolute filth from my skimmer once a week. And it's is rank and nasty. Wouldn't want it in my tank, but that's my opinion.
I have heard of other methods, like the Eco-systems, Mangroves (want to try this someday), algea scrapers, heavy mechanical w/carbon, and none at all. Everyone will swear their setup is best if they have any success with it. Personally for the $, a skimmer is the best way to go. Of course IANAE and my tank has only been up for 8 mos. I have read about ppl running without them just fine for over a year, and then having everything in the tank go in a matter of days because of the slow buildup of crud. Seems like cheap insurance to me.
I am not saying you won't have success without one, I just believe, based on what I have read, from talking to other ppl, and my own experience, a skimmer is a wonderful tool for keeping your small ecosystem alive.
My advice get one, a good one, but each to his/her own.
Now let the bloodshed begin.