Some Cool Plant Info and Research:
First up is a website with a study from sciencedaily which through tests in a controlled environment showed that the canna plant can remove up to
98.7% Nitrate and 91.8% Phosphate!
Thats a huge amount if your a fish keeper. Though these plants can grow tall, so I guess regular pruning would be required and they also produce beautiful flowers.
http://www.sciencedaily.com/releases/2009/12/091210153659.htm
Next up is an article about water mint and other wetland plants. However the portion that was most interristing to me is the table that shows that this plant can reduce harmful bacteria like E.coli, Enteroccocci and Salmonella by 90%, just by 2 hours of contact with the affected water.
http://cru.cahe.wsu.edu/CEPublications/eb1723/eb1723.html
Lastly just a link to Wikipedia that claims that peace lilies can remove toxins like benzene and formaldehyde from the air. Apparantly all that is needed is one plant per 10
m². So not only can it clean your fishes environment but also the fish keepers environment
.
http://en.wikipedia.org/wiki/Spathiphyllum
Just shows plants are amazing organisms
.