On Tue, 03 Dec 2002 15:23:18 -0500, Rich Conley
wrote:

arent nitrogen and phosphorus good for plants?

yes, in controlled amounts. Even in a tank with a power filter,
enough of the waste will break down and release nitrogen and
phosphorus. In fact, even with a power filter, you will often get too
much phosphorus, and sometimes too much nitrogen.

You want the nutrient levels to be controllable. With a UGF that you
can't clean correctly, the levels will not be controllable.


Chuck Gadd
http://www.csd.net/~cgadd/aqua