Related Clues:

• Plankton, in part
• Aquarium problem
• Garden variety?
• Pond life
• Pond growth
• Aquarium growths
• Seaweed
• Rootless life of the sea
• Kelp and others
• Primitive aquatic organisms
• Aquarium growth
• Pond scum and kelp
• Tiny pond plants
• Pond accumulations
• Photosynthetic organisms