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Fish load and CO2

At 03:48 AM 9/30/98 -0400, David Ozenne asked:
> is my heavy fish load the determining
>factor that prevents bubbling on a regular basis by keeping the oxygen
>level below saturation?

You bet, those fish will keep the O2 level way down.  And the fish will
like it.   So the O2 goes straight from the chloroplasts to the water, in
solution the whole time.

>From: BlackNet Runner <br at ldl_net>
>1) if I purchased a 5lbs co2 tank for the 20 gallon how long would it last?
> 2) where would I get it refilled at? weilding supply companys and the like?

A little deja vu for you regular readers:

How to buy a CO2 tank.

There are two main sources of CO2 tanks:  welding supply companies
and beverage industry suppliers (for carbonation of soft drinks).
Generally, a tank costs about $50 for a 5# tank and $75 for a 20#
tank.  Some suppliers also rent tanks.  $1 per month is a frequent
figure.  You may decide it is more economical to rent.

CO2 comes generally from the same source as your tank.  A refill of
20# is about $15, 5# costs a little less.  You usually exchange your
tank when you refill.  For this reason, it is perfectly OK to start
with a used tank that has been checked out for safety by the seller.

A little CO2 goes a long way.  One pound of CO2 is about 60 gallons
of gas at room temperature and pressure.  That will supply most tanks
for about a month.  Two gallons a day is a heck of a lot of CO2.

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com
FormMaestro                              <http://www.wcf.com>