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Nitrogen sponges

At 03:48 PM 11/11/1999 -0500, KAnderson at psg_ucsf.edu asked:
>Subject: Plants for grow out tank.
>[compared to duckweed/hornwort]
>Does anyone know of a better low light, no hassle nitrogen sponge?

Sure, Salvinia sp., Ceratopteris sp., Limnobium sp. are all quite good.
And much less likely to get out of control than duckweed.   They all have
great frond/root systems that harbor lots of tiny inverts that make good
first food too.
Dave Gomberg, San Francisco            mailto:gomberg at wcf_com
For low cost CO2 systems that work:  http://www.wcf.com/co2iron 
Tropica MasterGrow in the USA:      http://www.wcf.com/tropica