Re: [AGA-Member] Low-light tanks & CO2

["D'Wyatt" <dgreenx@airmail.net>]

Why do you need to lower the ph?

The Discus are just fine in that water. Most all of the Discus today 
are raised in tap water
so there is no need to try to have them in very soft water.

D'Wyatt Green


On Sep 27, 2005, at 6:20 PM, S. Hieber wrote:

> A buffer will raise you KH, not lower it. The easiest way
> to lower the pH is to add a mild acid. Adding CO2 will do
> this since a portion of it in water forms carbonic acid. IF
> your tapwater is 7.5, you shouldn't have any problem
> getting the pH down to discus-target levels by adding more
> CO2. If your KH was 3 degrees, 30ppm of CO2 would drop you
> down to a pH of 6.5. So with tapwater of 7.5, and not
> adding other acids, CO2 should do the trick without ever
> getting to harmful levels.
>
> I would probably raise the KH a couple of degrees by adding
> some calcium carbonate or sodium bicarbonate with each
> water change. A little buffering will keep the pH a bit
> steadier. Even if you raise the KH up a couple of degrees,
> you can still get a nice 6.5 pH without overdosing on CO2.
>
> Adding CO2 doesn't require adding more light although the
> inverse is not necessarily true.  YOu might find you need
> to add a littel more ferts or fish food -- but with discus,
> that is usually not a problem, given their ravenous
> appetites. ;-)
>
> hope that helps,
> sh
>
> --- Adam Michels <amichels@trafficleader.com> wrote:
>
> > Hi, everybody. I joined AGA only a few weeks ago; I was
> > wondering why
> > everyone liked mosses so much until I received the new
> > quarterly!
> > Anyway, I'm confused about achieving equilibrium in my
> > low-light plant
> > tank, and I could really use your advice.
> >
> > Tank specs:
> > Tank: 75 gallon
> > Lighting: 4 28W T5 full-spectrum(2) and 6700K(2), 1 20W
> > fluorescent, 1
> > 15W fluorescent
> > Filter: Fluval 304
> > Substrate: 2/3 Flourite, 1/3 Eco-Complete
> > CO2: 2 Hagen Nutrafin DIY yeast reactors + 2 ladders
> > Heating: 2 250W Stealth
> > Set-up: 2 10lb. plus driftwood stumps
> > Plants: 1 large Aponogeton boivinarius, 2 Aponogeton
> > madagascarensis, 1
> > Aponogeton crispus, several odd smaller Aponogetons, 12+
> > Crypts, 1 large
> > Kleiner Bar Sword, 1 Echinodorus major, 1 Echinodorus
> > osiris, several
> > large Anubias barteri tied to driftwood, mid-sized
> > Anubias congensis,
> > nana, azfeli, frazeri, Sagitarria subulata, many
> > Sagittaria pusilla
> > (Dwarf Sags), many Echinodorus tenellus and some java
> > moss
> > Fish: Five 4-5" Discus, five Roseline Barbs (denisoni), 3
> > spotted
> > headstanders, 1 gold nugget plec (small), 1 rubbernose
> > plec (small), 1
> > pair killifish (Nothobranchius kafuensis) and 4 emerald
> > cories
> > Tap water: 7.5 pH, 1 dH(17.8 ppm) carbonate hardness
> > Tank temp: 81-82 degrees F
> > Additives: Kent Freshwater Plant liquid fert. every water
> > change,
> > crushed coral in the filter bed to raised KH and GH
> > Water Parameters: NH4=0, NO2=0, NO3=less than 12 ppm, pH
> > 7.5 before
> > turning off lights (haven't checked morning reading)
> >
> > I wish I had a picture. Things are fine other than I do a
> > lot of water
> > changes. But I want my plants to flourish, and the fish
> > to enjoy water
> > parameters similar to their natural habitat. The problem
> > lies in that I
> > can't get my pH down. I do so many water changes for the
> > discus that the
> > driftwood doesn't have a chance to release enough tannic
> > acid fast
> > enough, and I don't add enough C02 to lower the pH.
> > Should I buffer? I
> > want my pH under 7.0, for sure.
> >
> > Am I going about this correctly? I raised my discus in a
> > species tank,
> > bare-bottom, but they don't seem to mind the new
> > additions. The killis
> > look hilarious, but I don't have any where else to put
> > them!
> > Any suggestions would be greatly appreciated.
> >
> > _______________________________________________
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> > AGA-Member@thekrib.com
> > http://lists.thekrib.com/mailman/listinfo/aga-member
>
>
> * * * * * * * * * * *
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> entries in the 6th Annual International Aquascaping Contest. Every 
> continent is represented -- except Antarctica. Maybe next year 
> Antarctica, too ;-)
>
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