Related Clues:

• Organism that can be brown, red or green
• Pond problem
• Tank top?
• Snails' snack
• Fishtank growth
• Marine flora
• Dairy substitute
• Japanese sauce
• Aquatic organisms
• Steak sub?
• Bean curd source
• Tofu provider
• Brown condiment
• Lake floaters
• Bottom-of-the-food-chain organisms