Quick background info:
Pressed 2 gallons of juice 9/8. Added 2 campden tablets.
Pressed 3 gallons 9/10. Added 3 campden tablets. Combined in a 5-gallon carboy.
Added 1 packet Nottingham yeast 9/12.
Posted in the "Sulphury Cider" thread 9/28-9/30. Tried aeration and quick carbonation of half the batch to try to get the smell out.
Racked to secondary 10/1.
Racked to tertiary 10/30. Added a cinnamon stick and a clove.
Sooo, now it's 11/12 and there is a light dusty coating of something on top of the cider. It looks like a light snowfall, or a thin dusting of powdered sugar. There is one dusty bubble right in the middle of the surface, actually sticking up above the surface. Here is a photo of the bubble: https://www.dropbox.com/s/87c2qlnbtt0tg1w/2012-11-12%2015.30.40.jpg
The stripey lines in the picture are where the surface stuff folded when I moved the carboy to get the bung out to take the picture. They weren't there before, just a thin layer of the dusty stuff.
I've looked at other threads but this seems not to be the same "flowers of wine" that other people have posted about. It's a very light dusting all over the surface, not big clumps of white.
Can this cider be saved? I only had a 6-gallon carboy when I racked it the second time, so it may be related to having way too much headspace and oxygen in there. (Or any of the myriad other mistakes I made on this batch