Marimo Moss AquariumMarimo, a Japanese word which literally translates to seaweed ball are not moss at all theyre actually a rare form of spherical algae. Theres no central stone or kernel inside the sphere its solid algae, radiating from the center, growing radially outward at the snails pace of just 5mm per year. In natural habitats it can grow up to 8 12cm in diameter. Light: Keep it where it will be in low light, not near a window or rays of sunlight as this will