I’ve been amazed at how well the Hornwort has flourished in 25% seawater. As has the duckweed. The HW floats, is a dark green,and grows in long strands. It keeps light from penetrating too deep, and thus keeps the algae controlled. Michelle’s list mentions one sp of HW that is brackish adaptable. It says the DW isn’t. Maybe I’m just lucky.
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