Re: [GSAS-Member] CO2 Question

["Doerr, Jesse" <Jesse.Doerr@fei.com>]

I do inject CO2 into the tanks that Erik mentioned, but only into the
top tank.  The pH seems to stay pretty constant all the way down when I
do that.

One thing to be aware of with oyster shells and cuttle bone is that they
are primarily calcium carbonate (CaCO3).  They can be a nice addition to
a tank to help buffer the pH and add trace minerals that shrimp and some
other animals really like.  The CaCO3 will only dissolve enough until
the pH raises to a certain point then it will stop adding hardness to
the water for the most part.

You have to be careful though when you start injecting CO2, especially
if it's on a pH regulator.  If the regulator is trying to drive too low
of a pH level with CO2 you can end up creating a cycle where the CaCO3
will balance the added CO2 to the point that the water is extremely hard
with toxic CO2 levels for your fish.

Jesse 

-----Original Message-----
From: gsas-member-bounces@thekrib.com
[mailto:gsas-member-bounces@thekrib.com] On Behalf Of Erik Olson
Sent: Monday, October 19, 2009 1:47 PM
To: Greater Seattle Aquarium Society member chat
Subject: Re: [GSAS-Member] CO2 Question

> And such a thing could very well work on an existing system like
Jesse's 
> (cf. 2009 Home show -- http://www.gsas.org/homeshow2009.torrent) where
he 
> has three cascading tanks on top of each other.
>
>   - Erik

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