My first batch has been in the secondary fermenter for about a week now. Today I noticed white particles (resembling dust) very slowly falling down the inside of the carboy (could only see it w/ a flashlight though). There's a lot of it at the bottom. Please tell me this isn't mold?!? Also, there appeared to be iron particles floating around in it (they were orange and we have hard water, which is why I think they are iron) Any thoughts on this?