Related Clues:

• Aquarium annoyance
• Tiny aquatic plant
• Pond dweller
• Nonflowering plant
• Sargassum, e.g.
• Whale shark's meal
• Simple water dweller
• Marine growth
• It creates energy through photosynthesis
• Rootless plant
• Bit of pond scum
• Chlorophyllous organism
• Plankton part
• Aquarium organism
• Microscopic pond organism