Like C-Rider said, the stuff on the bottom is trub. You want to avoid getting that into the bottles (although it should settle during conditioning). One way to help with this is to slightly raise the front of the fermenter a little bit. Of course, this will allow less beer to be bottled but...
Hello from hot and dry Texas! Happy Independence Day. I've been brewing Mr. Beer for almost a year now and wanted to step up a bit. Just got a starter kit today off craigslist for $50. Pretty good deal. Watching a friend brew tomorrow and will be doing my first mini-mash chocolate stout in...