- ALGA
- Certain sea weed
- Aquatic plant
- Birdbath organism
- Giant kelp, for one
- Simple plant
- Kelp is one
- Kelp, for example
- Pond floater
- Aquatic organism
- Pond growth
- Seaweed
- Water plant
- Half a lichen
- Pond life
- A real piece of scum
- It's Latin for "seaweed"
- Scum component
- Pond organism
- Birdbath cover?
- Bit of aquarium gunk
- Bit of ocean life
- Piece of scum
- Stillwater growth
- Tank gunk
- Scum
- Dirty tank collection
- Shit in the tank
- Bit in a tank
- Primitive plant
- Sea growth
- Lichen component
- Fragment of pond scum
- Pool life form
- Kelp, for one
- Aquatic eukaryote
- Bit of plankton
- Kelp or plankton
- Plankton component
- Rootless plant
- Pond plant
- Kelp, e.g.
- One-celled plant
- Chlorophyll-containing organism
- Component of a lichen
- Phycological unit
- Oyster thief or mermaid's wineglass, e.g.
- Photosynthesizing aquarium denizen
- Marine organism studied by a phycologist
- Organism that's an ingredient in 15-Across
- A little green on the surface
- Bit of an undesirable bloom
- Biofuel component
- Part of a red tide
- Unwanted pool organism
- Red or brown organism
- Rootless pond plant
- Unwanted aquarium organism
- Frog spit, for example
- Blue-green birdbath bit
- Sargassum, for one
- Unwanted plant in a pool
- Bit of pond scum
- Chlorophyllous plant
- Plantlike organism
- Seaweed, e.g.
- Birdbath bit
- Plankton
- Plankton, e.g.
- Piece of pond scum
- Pond film
- Fish tank organism
- Pond dweller
- Marine plant
- Tiny aquatic plant
- Plant that's often pluralized
- Tiny pond plant
- Pond life form
- Simple water dweller
- Chlorophyll plant
- Kelp
- Sea greenery
- Bit of seaweed
- Blue-green growth
- Kelp or Seaweed
- Bit of pond vegetation
- Giant kelp, e.g.
- Stagnant water problem
- Stagnant water growth
- Microscopic pond organism
- Pool problem
- Lake organism
- Bit of phytoplankton
- Pool microorganism
- Lake plant
- Part of many a snail's diet
- Anabaena or chlorella
- Minuscule lake plant
- Bit of kelp, say
- Bit of 30-Down life
- Bit of fish tank growth
- Simple marine plant
- Bit of aquatic life
- Fish tank growth
- Fish food plant
- Aquarium growth
- Bit of fish tank gunk
- Bit of pond growth
- Red tide bloom
- Microscopic sea life
- Pool life
- Lichen symbiote
- Latin word for "seaweed"
- Oxygen releaser
- Simple organism
- Green growth
- Sea lettuce, e.g.
- Seaweed, in Latin
- Pond scum organism
- Frog spit, e.g.
- Spirulina, e.g.
- Unwanted organism in an aquarium
- Sea grass, e.g.
- Certain prokaryote
- Water silk, e.g.
- Plant of group including kelp.
- Plant of sea, fresh water, or land.
- What seaweed is.
- Sea moss.
- Sea moss or lettuce.
- Any seaweed.
- Sea lettuce.
- Rockweed.
- Water growth.
- Seaweed: Lat.
- Rockweed or sea moss.
- Sargasso.
- Sea plant.
- Ocean vegetation.
- Seaweed plant
- Pond scum
- Marine growth
- Chlorophyll source
- Anabaena
- Rootless aquatic plant
- Rockweed is one
- Diatom
- Fat-choy or nostoc
- Pesky pool plant
- Pond-scum component
- Stonewort, e.g.
- Seabeard, e.g.
- Stonewort
- This plus a fungus equals a lichen
- Unicellular plant
- Anabaena or nostoc
- Filamentous plant
- Rockweed, for one
- Diatom or nostoc
- Bit of kelp, e.g.
- Microscopic life
- Microscopic organism
- Spirogyra or frog spit
- Bit of Chlorophyta
- Chlorophyta bit
- Foot of a food chain
- Marine ___
- Bit of ocean flora
- Bit of seafloor flora
- Morsel for a sea snail
- Seaweed, for one
- Sea moss constituent
- Eukaryotic organism
- It lacks roots
- Lowlife?
- Tiny organism
- Tiny ponddweller
- Bit of scum
- Chlorophyll-containing microorganism
- Bit of aquarium growth
- Bit of rootless flora
- Mussel morsel
- Pool organism
- Unwanted swimming pool bit
- Film bit
- Morsel for a guppy
- Bit of stagnant-water growth
- Bit of fish food
- Bit of marine life
- Bit of pond slime
- Bit of birdbath gunk
- Fountain growth
- Bit in a fish tank
- Pool growth
- Word from the Latin for "seaweed"
- It helps turn a pond green
- Plant that lacks true roots and leaves
- Plant used in making biofuel
- Growth in an aquatic bloom
- Bit of film
- Plant that contains chlorophyll but lacks a stem and leaves
- Plant in a bloom
- Unwanted aquarium collection
- Aquarium organism
- Plant across the pond?
- Aquatic protist
- Scum on the pond
- Pond cover
- Aquarium dweller
- Primitive water plant
- Sea lettuce, for one
- Snack for a surgeonfish
- Reef denizen
- Aquarium annoyance
- Sargassum, e.g.
- Chlorophyllous organism
- Primitive water organism
- Some plankton
- Microscopic pond life
- Pond annoyance
- Minuscule lake organism
- Tiny aquatic organism
- Small bit of rootless flora
- Tiny lake organism
- Wee bit of marine life
- Kelp bit
- Plant in a pond
- Pond scum source
- Rootless thing in a pond
- Bit of gunk on a fountain
- Salt water growth
- Pond scum e.g.
- Pond tidbit
- Snapper's snack
- Flowerless plant
- Plankton morsel
- Stonewort or rockweed
- Piece of plankton
- Seaweed or kelp
- It creates energy through photosynthesis
- Part of a pond problem
- Rootless water life
- Tiny pond organism
- Rootless pond growth
- Blue-green plant
- Tiny organism that's often pluralized
- Bit of lichen
- Bit of aquarium scum
- Nonflowering plant
- Simple pond plant
