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ideas, please.

Hi guys,

I'm looking for plants that will coexist in unfertilized, very brightly
lit tanks with val. americana, hornwort and crypt. wendtii.  The water has
very little general hardness, but plenty of carbonate hardness and I've
measured the pH in the tanks over 9.  Soon (when the leaves finally fall
outside) these tanks will be getting about 6 hours/day of direct sunlight,
and they each have 2 15-watt flourescent tubes with soon-to be upgraded
reflectors.  Over the last couple years I've tried java fern, anubias nana
and a myriophyllum sp. with varying degrees of miserable failure.

I want to get enough growth in these tanks to put up some significant
competition with the green water.  Alternatively, can anyone think of any
(available) filter feeders that will live with grass shrimp, guppies and
otos?  One tank has a clam in it already - clams do so-so, but I haven't
been able to keep them alive more than about 9 months or so.

Awaiting your response,

Roger Miller
In Albuquerque where mother nature stopped dropping hints about the
coming winter and gave us a sobering early dose instead.