Skimmate Change - Biopellet Effect???

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Pre biopellets my skimmate is what I would call normal. The bubbles would form and climb over the top edge of the collection cup and then collapse into a liquid. I had to dig to find a photo, but here's an old one prior to installing a collection container for the skimmate.


IMG_4790.jpg





I've been running biopellets since June, 2013. About a year ago I started to notice the bubbles were not collapsing and would fill the cup and start to push out through the holes on the cover of the collection cup. In addition, the skimmate would now leave blotches on the side of the collection cup.









I was still getting skimate in the collection containers, but now had a very strong odor of sulfur (rotten eggs).


Has anyone else experienced this? And do you think it's from running biopellets (sloughed off bacteria)?
 
This effect also coincided with the start of my biopellets, but subsided eventually.
 

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