This video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, with some being yellow and others being green. The aquarium is well-lit, and the fish are swimming around the tank, occasionally coming up to the surface. The water is clear, and the tank appears to be clean and well-maintained. The fish are moving around freely, and there are no visible signs of stress or agitation. Overall, the video provides a peaceful and calming view of the fish in their habitat.