If I were a plankton, I would most likely live in the upper layers of the lake, specifically in the photic zone, where sunlight penetrates.
This region is abundant in nutrients and supports a diverse community of microorganisms. As plankton, which include tiny organisms like algae and zooplankton, we rely on sunlight for photosynthesis and food. The upper part of the lake is where light and warmth create suitable conditions for growth and reproduction.
Moreover, staying closer to the surface allows for better access to nutrients that run off from the land, enhancing our chances of thriving among fellow plankton. The lower depths, often characterized by cooler temperatures and lack of light, would not be favorable for survival.