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Living in Houston, where the water has 5+ ppm phosphates directly out of
the tap, I have big algae problems.  Purified water does help, but is no
cure.  The SAEs don't seem to do much and the trumpet snails are happy,
but the algae is still winning.  I was watching a show on outdoor ponds
and the show mentioned using something called rockgrass to control algae
in outdoor ponds.  Does anyone have any experience with this in an