Related Clues:

• Aquarium growth
• Sea moss constituent
• Sea lettuce, e.g.
• Plankton component
• Chlorophyllous plant
• Aquatic plant
• Pond floater
• Pond scum component
• It lacks roots
• Lowlife?
• Pond scum
• Seaweed, e.g.
• Eukaryotic organism
• Aquarium annoyance
• Tiny aquatic plant