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Genus Azolla

Has anyone ever kept this genus of plant before?  It is a floating
fern, closely related to Salvinia, but has symbiotic algae that live in
its leaves.  These algae fix nitrogen; therefore, I was wondering if
keeping this plant would alleviate adding nitrogen supplement to the
planted tank (i.e. KNO2).

Jason Miller
Sherwood Park, AB
(780) 464-9635

Still interested in those floating ferns!