The video captures an indoor aquarium filled with water, live green aquatic plants, and various fish. Several species are visible, including red-colored fish that resemble platies or swordtails, and guppies with different fin patterns, including some with black and white tails. Small fish, likely fry, are swimming near the water's surface, particularly under a blue fixture that extends across the top of the tank, possibly a filter or light. The fish are actively swimming throughout the tank, with some exploring the plants and others moving near the surface. The aquarium has a dark background. No text is visible.