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aquatic plants use nitrates

Gerry, definitively, aquatic plants can use nitrates. They will however
use ammonium before using nitrates if there is ammonium present. You
would need to supply elevated levels of potassium and other nutrients to
stimulate enough growth to consume all the nitrates.

Try to reduce the quantity of fish feeding and the number of large fish
in the aquarium. The amount of plant mass you have to grow and harvest
is proportional to the amount of food you dump in each day. Using a
house plant like Philodendron with the roots in the tank, can absorb a
lot of nutrients too. Beware the growth tho!
Steve Pushak                              Vancouver, BC, CANADA 

Visit "Steve's Aquatic Page"      http://home.infinet.net/teban/
 for LOTS of pics, tips and links for aquatic gardening!!!