Related Clues:

• Pond coating
• Life on the water
• Chlorophyllous plant
• Aquatic plant
• Pond floater
• Pond scum component
• Sushi ingredient
• It lacks roots
• Lowlife?
• Pond scum
• It may fill up your tank
• Seaweed, e.g.
• Eukaryotic organism
• Pool owner's bane
• Aquarium annoyance