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Amazon Frogbit?

I've noticed in recent discussions, the mention of Frogbit.  I believe
that Chuck Gadd indicated that it was a good indicator for iron
deficiency.  I'm trying to locate some.  Westerleigh Aquar., in N.Y.,
lists Giant Duckweed(Lema Polyrhiza) for sale.  Would this possibly be
the same thing?
Thanks to everyone for their help with Staghorn algae.  With the help of
adding Phosgard to the filters, and drasticly reducing my TMG dosage(to
0.5 cc. every 3 days), the algae is under control.