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Re: oxygen deficiency

> It can also happen in perfectly maintained, sparkling clean, heavily
> planted tanks.  How?  High altitude and hot summer nights.  I find that
> in all of my tanks, I have to run an airstone at night.  An air pump

What kind of altitude?  Here at 5300 feet, I don't need any airstones
in either my 29g, or on my over-stocked 75g.    I think with fast
plant growth (via CO2 injection, high lighting, and lots of plants),
that the plants can supply more than enough O2 to make it thru the night
without problems, even at high altitude.

Chuck Gadd