March 28th — Yikes! I had to move my columns a bit to get out onto my balcony. I thought I had been very careful, but apparently enough water in Column C (Thames Mud + Tap Water, middle right) sloshed on top of the biofilm on the surface, enough to sink part of it! (fig. 1). The biofilm, which had been covering the entire surface, has now bent in the middle, with half of the film hanging down into the water. I wonder what will happen to all those microorganisms... The other three columns appear unaltered.
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