Craft a 300 DPI coloring book page showcasing the beauty of deep-sea coral gardens. Picture colorful soft corals, sponges, and sea fans, providing shelter for creatures like the squat lobster and basket stars. Use only clear black outlines to depict this vibrant deep-sea ecosystem, ensuring ample white spaces for artists to color. Remember, no shading whatsoever; the outlines alone should transport the artist to this hidden marine paradise make it have a background.