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Re: H. Polysperma
> H. polysperma will
>_only_ grow well with a soil substrate. this is in tanks with and without
>CO2 and with and without strong light. I don't know if this is another
>copper sensitive beast, or whether there is some other factor involved.
I'm not sure I understand the connection between the substrate and the
successful growth rate of H. polysperma. H. polysperma in my tank send out
roots at the various nodes throughout the stem. I always assumed that the
roots derived the nutrients from the water column. They eventually get
into the substrate, but the growth rate before and after they make it into
the gravel appears to be the same.
Elk Mound, WI, USA