11.29.14: More layers?

Happy Day After Thanksgiving, guys! Check out my columns today:

***UPDATE***: Actually, both of my columns are anaerobic right now. I'm at my boyfriend's house, so I didn't want to impolitely set an open jar of dirt and bacteria in his lovely home. I will introduce oxygen to Column #2 (right) starting tomorrow.

Column #1 (left) has quite a few layers established....but what used to be my top water layer is now gone.

I can't say for sure what is happening, but feel free to take a look:

This is a photo of Column #1 from an aerial view. See the BLACK layer growing in the mid-bottom left corner of the photo?:

Column #2 now has a layer floating on top of the water layer. Is it debris, small gas bubbles, a bacterial colony, or all of the above? The dark layer is very noticeable in this column. Here:

Next, I will start leaving the cap off of Column #2 to allow the column to have access to oxygen

***UPDATE***

The cap on Column #2 was ACTUALLY TAKEN OFF on December 1, 2014.