Water-net algae is a filamentous green algae known for its distinctive hollow, tube-like structure, which, upon closer inspection, forms a hexagonal net-like pattern. This algae thrives in nutrient-rich waters, where it spreads rapidly through fragmentation, often forming dense mats that can quickly overtake a pond. While it plays a role in aquatic ecosystems, excessive growth can reduce water quality, block sunlight, and interfere with recreational activities. Proper nutrient management and early intervention are key to controlling water-net algae and maintaining a balanced aquatic environment.