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Re: How to maintain high PH/KH with CO2 injection

on 20/1/00 8:40 pm, Roy Cheok at roycheok at cyberway_com.sg wrote:

> I've been a silent lurker on this list for the past 2 yrs.....and
> finally coming out of the shell.

Welcome Roy! You've finally spoken :-)
> I intend to setup a planted Africian cichlid (with Altolamprologus
> Calvus from Lake Tanganiyika). Not too sure if this is possible.....
> but I've been told that these cichlids do not dig up substrate,
> do not chew up the plants and generally remain small, being very slow
> growers.  The problem is that the PH/KH needs to be relatively high...
> compared with the usual acidic waters of the planted aquaria.

Actually, I've been meaning to ask this too. The chiclids I want to keep
though are known as the shell dwellers ... Neolamprologus Brevis a
Tanganyikan native as well.

> The question is....is it possible to maintain a high PH of 8 - 8.5, dKH
> of >8...in a CO2 injected tank that would be optimal (maybe not quite
> optimal...but acceptable) for reasonable plant growth.

I believe *some* plants can grow in harder waters, vals for instance. I was
hoping to have the chiclids in my new Emersed Tank (see website for details)
where the fish would live in about 4 inches of water. The main plant would
be hairgrass. 

> Obviously the injected CO2 will tend to lower the PH and KH...etc, but
> if I maintain sufficient buffers with the addition of sodium bicarbs,
> magnesium sulphates, borates...etc (with marine KH buffers),
> can this be done...to have high PH/KH and yet a reasonable concentrated
> of CO2 in the water.  From the KH/PH/CO2 tables....it doesn't seem to fit
> ......but I was just wondering of anyone here has played around with
> this before.....

I guess if we prep the alkalinity to about 6 degrees KH, we should no
problem right? I was hoping to use Baking Soda (whch I used to use in my
4-footer). Anyone can help?

Mark Pan
Accept certain inalienable truths: Prices will rise. Politicians will
philander. You, too, will get old. And when you do, you'll fantasize that
when you were young, prices were reasonable, politicians were noble and
children respected their elders.
Baz Luhrman / Mary Schmich