In the video, a man is seen kneeling down in a large fish tank. He is wearing a black shirt and has tattoos on his arms. The man is using a brush to clean the rocks in the tank. The water is clear and there are no fish visible in the tank. The man is focused on his task and appears to be taking his time to ensure that every part of the rock is cleaned. The tank is well-lit and the man's reflection can be seen in the water.