Re: Yeast Explosion
To: aquatic-plants at actwin_com
Subject: Re: Yeast Explosion
From: "shaji (s.) bhaskar" <bhaskar at bnr_ca>
Date: Tue, 18 Jul 1995 11:06:00 -0400
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>From: "David Huie" <David.Huie at Bentley_COM>
>Subject: Yeast Explosion
> I have a problem that I'm hoping someone can give me suggestions on.
> I've had all the fish in my tank killed by acidosis...twice now. Both
> times were as a result of massive pH changes due to my inaccurate CO2
> injection method.
> The first time, the tank just ran out and the pH went from 6.2 to 7.8
> in about two hours.
What's your KH? With a KH of 4, I bring the pH down from about 7.6 to 7.0.
That's not too big a swing for most fish if the CO2 runs out.
> The second time, last week the whole CO2 tank vented into the aquarium
> at once--a one inch shell of ice on the CO2 canister was a bit
My first thought would be that you have a really poor regulator. Most
folks running open-loop (i..e., without a pH controller) use two-stage
regulation. The first stage brings the pressure down to 10-20 PSI.
A second stage (needle valve) controls the actual rate of CO2
injection into the tank.
> I won't cope with another mass fish death due to massive pH
> fluxuations and I don't think I can afford a fully-automated CO2
> injection system--and I won't go back to my old unreliable yeast
> method. Isn't there a reasonably affordable reaction chamber
> available to help dissolve CO2? Even That Fish Place claimed to have
> no such thing. I had to makeshift--and it turned out to be the death
> of my fish.
A diving bell a la Tetra will give you an upper limit on the rate of
CO2 injection, provided you have a somewhat *reasonable* regulator.
With the bell method, the rate of CO2 injection is determined by the
surface area of the CO2-water contact, and if you inject too much, the
CO2 will simply escape.
Shaji Bhaskar bhaskar at bnr_ca
BNR, 35 Davis Dr., RTP, NC 27709, USA (919) 991 7125