Although I have none of the expertise of Commander Cody I completely agree on the Elodea issue. Having battled Elodea I can't imagine why anyone would intentionally add it to any pond. To say that it is highly invasive is an understatement and it will grow in both shallow and deep water.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)