Used when breeding fish, the free-floating hornwort - Ceratophyllum demersum acts as a great cover for spawning. Planted or left floating, this aquatic plant, like the Cabomba, is a great oxygenator.
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The Hornwort - Ceratophyllum is considered unique enough to warrant its own family, Ceratophyllaceae, and its precise relationship to other angiosperms remains unclear.