Answer: algae

AnswerCrossword Clue
ALGAEFishtank concern
ALGAEStagnant-water buildup
ALGAEThey may live on a turtle shell
ALGAEAquatic plant life
ALGAEPlankton component
ALGAEPond organisms
ALGAEAquatic organisms
ALGAESimple organisms
ALGAELake floaters
ALGAESea moss, for one
ALGAEAntifouling chemical target
ALGAEHigh-yield biodiesel source
ALGAEPond covering
ALGAEPond plants
ALGAERootless sea life
ALGAEPhycologist's study
ALGAEAquarium growth
ALGAEBig oxygen producer
ALGAEBottom-of-the-food-chain organisms
ALGAEPool service bane
algaeone-celled water plants
ALGAETank buildup
ALGAEPool problem
ALGAEPond growth
ALGAEPool owner's bane
ALGAEPrimitive plants
ALGAESwimming-pool problem
ALGAEPond cover, frequently
ALGAESingle-celled plants
ALGAEWinter forecast
ALGAEPool covering, perhaps
ALGAEPond scum
ALGAEAquarium buildup
ALGAEAquarium problem
ALGAEPond scum and kelp
ALGAEPond scum and seaweed
ALGAEPond or pool stuff
ALGAEPond scum and such
ALGAESeaweeds, et al.
ALGAESeaweed and such