Newbie Bill wrote:
Cichlidiot - I have read a number of times that Anacharis is not truly an
oxygenating plant. That there is little net yield in oxygen due to
respiration and should really only be put in a pond for its value of using
up excess nutrients in the water. Do you believe there is greater benefit
in more confined aquariums(I'm setting up two)? Of course, this could be
the ol ask 6 people and you'll get five different answers since some sites
are so specific about having x bundles per x square ft of pond surface.

As others have said, in the presence of strong light, you will see the
plant "pearling". If there is any breaks in the stems or if the plant is
free floating, you will see streams of oxygen bubbles rising from the
breaks and ends of the stems. In the home situation, I have only seen this
when the tank gets a good dose of natural sunlight.

Now I'm more interested in the tropica.com Egeria dense entry that reads:

"The plant secretes antibiotic substances which can help prevent
blue-green algae (a type of bacteria)."

Anyone have experience with that?