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Re: Water changes/N & O2 / fish load

> Date: Sat, 07 Oct 2000 11:56:52 -0700
> From: Thomas Barr <tcbiii at earthlink_net>
> Low O2 can hurt plants as well as fish but the plants are much slower to
> react(days to weeks compared to hours or minutes in some cases)
> O2 is the forgotten gas that the plant needs. We all tend to be so concerned
> with CO2 so often. I wish I had bought that O2 tank for 10$ at the flea
> market awhile ago:(
> Comments?

Since the plants will saturate the water with O2 during the day if you have bright lights, I really doubt that the oxygen will be depleted overnight enough to stress the plants.  It might be something worth obsessing over when you have *everything* else set up perfectly.

That $10 oxygen tank might have been useless.  Most gas suppliers will not fill anything larger than those little 20 cubic foot tanks unless you have all kinds of paperwork to prove that you are the owner.  Also, the tanks have to be hydrostatically tested periodically.  If your used tank is out-of-test, it might cost you $20-$30 to get it tested and recertified.  That may not be an issue with the 20 ft3 tanks, because the gas suppliers usually just swap them (that's probably why they don't require proof of ownership).  I wonder about those surplus medical 'E' tanks for sale on eBay. (Tall skinny O2 tank, holds about 24 ft3, has a CGA870 valve.) How does anyone ever get those refilled?

Best regards,