Giant Duckweed
Spirodela polyrhiza
Floating Plant
Floating
BeginnerLow
Undulata is most often used midground and background, so these coexistence guides focus on other plants that can share that space and care envelope without turning the scape into a maintenance fight.
Spirodela polyrhiza
Ceratophyllum demersum
Lagenandra meeboldii
Fissidens fontanus
Isoetes lacustris
Littorella uniflora
Salvinia minima
Cryptocoryne usteriana
Bacopa monnieri
Anubias afzelii
Anubias barteri
Anubias heterophylla
Sagittaria subulata
Anubias gilletii
Anubias gracilis
Anubias hastifolia
Samolus valerandi
Fontinalis antipyretica
Microsorum zippelii
Cryptocoryne crispatula
Nymphoides aquatica
Fissidens zippelianus
Taxiphyllum barbieri
Taxiphyllum alternans