Yah it is very hard to see. You can see the darker spots in the first picture - that is the algae.
10 hour photoperiod.
I also am getting a white foam on top of my water - bubbles.
And I just lost another RCS - I have had this colony for over a year and it seems like healthy, adult shrimp that are dying. It just slows down and dies - the only visual change being that it looks pale. Seeking shrimpers help as well so I don't cross post.