Generate a lively underwater scene featuring a cheerful, octopus playing with a group of colorful tropical fish in a coral reef. The octopus should have a playful, expressive face and smooth, tentacle movements, while the fish should each have unique, vibrant patterns and shimmering scales. The coral reef should be bursting with life, featuring bright orange, yellow, and turquoise corals, swaying seaweed, and glowing anemones. Add dynamic lighting effects, like sunlight streaming through the water, creating rippling reflections on the ocean floor, and tiny bubbles rising to the surface. Include small details like the texture of the sand, the translucency of jellyfish in the background, and the playful interaction between the characters and their environment. The scene should feel alive, joyful, and full of motion.