Modifiers matching algae:

• marine,
• sized,
• unicellular,
• toxic,
• benthic,
• motile,
• complex,
• floating,
• planktonic,
• microscopic,
• eukaryotic,
• soft,
• photosynthetic,
• small,
• undesirable,
• diverse,
• symbiotic,
• large,

Simple categories matching symbiotic:

• algae,
• organism,
• invertebrate,
• microorganism,
• bacteria,