On Fri, 04 Jul 2003 04:53:53 GMT, wrote:

during the day plants in the water make oxygen
at night when the lights go out the plants quit making oxygen and begin using it.
after the lights go out the oxygen levels start falling, continue falling until the
sun comes up.
aeration from midnight until the sun is well up is the most important time.
algae, high water temps and rotting mats of organic debris on the bottom sucking up
oxygen are the worst combinations. Ingrid


Man, i love this group!
Thanks, Doc.