Week 4 Update
@taricha “No Ug” treatment continues to distinguish itself from the control, showing much less algae accumulation even after four weeks (See photo’s below comparing control (left) v No Ug (right) at 2 and 4 weeks of growth, top and bottom rows, respectively).
The development of the golden color in the control is likely a sign that the autotrophic biomass has reached the carrying capacity of the system. The nutrient input is just enough to maintain the biomass that accumulated some time ago and now the organisms are struggling. I think the golden yellow appearance is from the cyanobacteria that have accumulated on the algae filaments.
Below is a closer look at the aquaria. The left image is taken through the front side and the other image is the top view. The white lines are there to connect landmarks in both photos. I examined individual algae colonies in the No Ug treatment and did not find any cyanobacteria. I wonder if ChemiClean alone is responsible for this lack of cyanobacteria. Pink algae colonies are hemispherical filamentous algae. The green colored sand persists and consists of very small, short filamentous algae (I assume) that completely coats each sand grain, radiating from the surface.
The slimy appearance of the growth in the control is from the extensive cyanobacteria growth. I assume much of the algae biomass in the control is going to become the biomass of other organisms soon.
The next two photos, control and treatment, respectively, show the surface growth on microscope slides placed in the aquaria two weeks ago. The slide culture represents the organisms that settled and dominated the slide some time ago. This does not necessarily represent the same organisms dominating the ecosystem tiday. New slides were placed in the aquaria today for an updated census.
The control slide shows robust growth with a thick algae biofilm coating the glass (the covering of dots) overlayed with diatoms, cyanobacteria and other organisms. The No Ug treatment slide shows very sparse growth.
Back in two weeks with the next installment.