On Easter, our column has received less sunlight than we expected due to an incident with the shutters of the window, so the "light side" became darker. But now, after some days receiving its pertinent sunlight the brownish colour has appeared again. Now it shows a thick red line surrounding some black parts, which is good because we expected in our hypothesis something like that to happen (red bacteria are sulfur bacteria).
In addition, we can see how the surface of the water is full of bubbles, which means that some bacteria are releasing gases (such as oxygen). Also, in the middle of the column there are many series of "air bags" (might be CO2).
Now the weather is improving and our column will be able to recieve more sunlight.
Redish lines
Light side
Light side and red lines.
Light side
Shells on the upper aide
Dark side (detail)
Dark side
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