Now two months and a few days later, this is what has transpired within my small aquatic ecosystem.
Not only do I have an abundance of algae but there are also cyanobacteria begining to develop in the tank, along with vorticella, numerous flagellates, and water fleas.
Some time back, maybe a year or so, I posed the question as to why I had better luck collecting samples in the colder winter months than in the summer. It seemed that during the wintertime here in the mountains, there was an abundance of protists to be found and numerous species of them. However when the weather began to warm, this abundance of protozoa declined sharply. I think I may have found my answer while researching the Mayfly nymph.
Protozoa and all benthic macro invertebrates rely on a certain amount of dissolved oxygen in the water for their survival and well being. The warmer the water becomes the less the amount of dissolved oxygen (DO). Without a reasonable level of DO these organisms will soon die out, much the same as what sometimes happens to putrid plant infusions. However there are certain organisms which can tolerate low DO levels. During my research on the Mayfly nymphs it was stated in several publications that the colder the water, the higher that the dissolved oxygen levels will be and the macro invertebrates will thrive better in cooler waters than in warm. Which explains why my Mayfly nymphs in the aquarium died but it may be that protozoa are affected by this also, which goes back to my seasonal observations during collections. So the success of the collection of numerous species of protozoa may well depend upon two things or so it seems here in the mountains. The water temperature and the amount of dissolved oxygen. The lower the water temperature, the higher the DO level and the greater the chance of collecting a diverse assemblage of protozoa.
I should mention that my observations are based on lotic environments such as mountain streams and not on lentic waters such as lakes and ponds. However the broader the body of water in lentic systems, the greater the surface area for wind currents to stir the water and increase the amount of dissolved oxygen in those systems. It would be nice if I had a way to refrigerate my tank to increase the DO level and see what may develop in its waters. 
(Literally 
