Friend of mine asked me to identify this and wasn't able to.
http://www.youtube.com/watch?v=tcK2J99G9A8
It's a freshwater tank. I almost have the same thing going on in my brackishwater crab tank, but it seems to go away when I change the carbon. Protein? Protein skimmer needed? Isn't that just for saltwater tanks?
I noticed he doesn't have much water aggitation. Could that be the issue?