Various green bacteria are growing now all over the panel. These are likely to be cyanobacteria and some green sulfur bacteria.
You may also notice the addition of clamps along the bottom. On Day 33, I arrived to find a puddle below the panel and all of the water drained out. Luckily, the crack was too small to let any soil out. The clamps are holding well so no more leaked out after I refilled it. Perhaps I can claim that this is an experiment in shocking the ecosystem with a drying and aeration event? I didn’t notice any significant changes in the following days and weeks, except the continued growth of green and yellow bacteria, so I suspect the shock wasn’t too detrimental.
In the last several days, a filamentous green colony has developed. Note the large gas bubbles around it. This is likely a cyanobacteria like Oscillatoria, so the gas would be oxygen generated through its plant-like photosynthesis. The two images above show the top right corner of the panel at day 35 and then day 49. Notice how the black mud is slowly being covered by the growth of a very diverse mixture of microbes.