Related Clues:

• Simple aquatic organism
• Rootless sea life
• Birdbath organism
• Aquarium nuisance
• Fish tank organism
• Pool service bane
• Kelp, for one
• Rootless water life
• Aquatic plant life
• Pool owner's nuisance
• Pool microorganism
• Tiny pond organism
• Bit of aquarium growth
• Pool invaders
• Biofuel source