At a glance, the aquarium has changed in many ways from my original observations. New developments include diatoms (pinnularia), pseudopodia (actinosphaerium), and a large amount of new plant tissue. The actinosphaerium are very slow moving and remain fairly close to the plants. I identified them using the reference book
Free Living Freshwater Protozoa by D.J. Patterson. They are small and interact with the paramecium bursaria in a repulsive manner. The paramecium bursaria have grown in number and in size. Last week they were considerably smaller than the rotifers inhabiting the aquarium; upon this week's observation they equal the rotifers in size and are greater in number. I have noticed many dead rotifers throughout the aquarium; they tend to grow at a lesser rate than other organisms or do not mature at all. However, those that have survived remain energetic and motile.
A nonmotile organism that is also newly developed is the Melosira. I identified the multiple specimens using the reference book
Freshwater algae: Their microscopic world exposed by John and Hild Lund.
Below is an image of this organism taken by myself during lab observation.
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