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Re: [APD] aeration & a planted tank

> However, even without CO2 injection, a heavily planted
> aquarium can (mind you I say "can," not "always will") have
> more than adequate O2 at night with adding the bubbly. In
> fact, I haven't in my own limited experience seen an O2
> shortage unless the electricity shutdown overnight and the
> pumps stopped. Which is why I've been curious about your
> set-up.

Another 2 cents worth of observation on this...  I have a 30 gal tank, very
heavily planted, 55W CF, no CO2 supplement (but I do supplement C with
Excel).  Every time I do a large water change (usually with fertilization
and Excel), the plants pearl madly for a couple days, and I can count on
seeing the fish at the surface 'gasping' for oxygen in the mornings.  One
thing to note is that here in Phoenix, the water temp in the summer is often
well over 80' F straight from the 'cold' water tap, and the tank usually
runs around 80-82' F, or sometimes even higher.

I'm guessing that the increase in temperature is contributing to the O2
depletion since the water holds less at higher temps.  After following this
thread,  I've decided to add some aeration at night to reduce the stress on
the fish.   It'll be interesting to see if the phenomenon goes away this
winter when I can keep the tank at a lower temp.

Terry S. in AZ

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