Related Clues:
- Koi pond scum
- ___ moss (bog growth)
- Swamp buildup
- Aquarium bother
- A bird of prey almost picked up fish food?
- Several seaweeds good in salad uncovered close to shore
- Pool concern
- Some fish food
- It gives whiskey a smoky flavor
- Ending for 're-' or 'three-'
- Quietly put away accumulated 19 of 16
- Green growth in a pond
- Pond scum, typically
- It gives many Scotches their smoky taste
- Growth from stagnation