This image depicts a brightly illuminated freshwater aquarium located in Obzor, Bulgaria

This image depicts a brightly illuminated freshwater aquarium located in Obzor, Bulgaria. The rectangular glass tank contains clear water, a black gravel substrate, and various aquatic life and decor. On the left side of the tank, a multi-layered black sponge filter is positioned in the foreground, connected to a blue air tube. A small blue air stone or diffuser is visible near the bottom of the sponge filter. A glass thermometer is attached vertically to the left tank wall via a suction cup. Mid-water on the left, an orange artificial fish-shaped toy with black stripes is visible behind a dark rock formation. Below this, a red and black circular object rests near the bottom. The tank houses numerous small fish, predominantly guppies, mollies, and platies of various colors, including orange, black, and speckled patterns. Several small, light-colored food pellets are scattered on the black gravel, particularly in the lower-left quadrant. A single larger yellow object, possibly food or a decoration, is also on the gravel towards the lower-mid-right. A pale, elongated fish swims near the bottom-left, and a small reddish shrimp-like creature is present among plants on the right side. Aquatic plants are distributed across the right side of the tank, including a cluster of green, broad-leafed plants rooted in the gravel and a taller, slender-leafed plant extending upwards. A yellow fish-shaped decoration with black markings and an open mouth is suspended near the water surface on the upper-right, appearing to interact with a plant stalk. Overhead lighting illuminates the tank, causing reflections on the water's surface. The tank rests on an indistinct wooden-like stand or support structure on its left side.