in the picture of the wall, its like that towards the back(from where the picture was taken, to the right, which would be a side of our apartment building. Behind the wall my neighbor has a patio, and then his building goes up. I never get sun directly from above either for some reason. To the left, there are 2 buildings and a 5ish foot gap between the 2, that is the only space through which sun comes in. But the wall should provide shade to the aquarium.