Low ph, Water Quality Report, a Question...

Biollante

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Beating Avoidance Mode

Hi Pat,

With a couple of exceptions, I think a minimum alkalinity of 4dKH is a real good idea. :)

This is somewhat controversial around here, so this is just between you and me. :eek:

Biollante
 

pat w

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OK, So I'm dosing sodium bicarb to raise my kH. 6 Tsp. each week into a 80 gal water column during a 50% WC. Should I be able to get a closer feel of the CO2 from the standard kH/pH/CO2 charts directly from a pH test of tank water since the lion's share of my kH now comes from carbonate?

Pat
 

Biollante

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Better Question Than I Have Answer

pat w;54980 said:
Should I be able to get a closer feel of the CO2 from the standard kH/pH/CO2 charts directly from a pH test of tank water since the lion's share of my kH now comes from carbonate?

Pat

Hi Pat,

A good question, I wish I had a good answer. :eek:

I would think that raising and stabilizing the alkalinity should make calculating CO2 via change in pH more accurate. I guess I still would not make myself too reliant on KH/pH/CO2 charts, still best to watch the plants and critters. :)

Biollante
 

pat w

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Well ... anywho ... I see a drop in pH from around 8.3, taken just before the CO2 starts flowing, down to about 6.8 min. All critters appear happy and healthy. Plants doing well as far as I can tell.

Pat
 

Biollante

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Mumbo The Jumbo

Hi Pat,

It does seem as though you have a good level of CO2. :)

The ultimate problem with ph/KH/CO2 tables/calculators is they assume CO2 is the only actor on pH.

An aquarium, especially a young aquarium with enriched substrates, has many actors. Some by themselves are negligible but together can have a noticeable or significant effect on the pH of the water column. :gw

Biollante
 

Biollante

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Calibrate, Calibrate Dance to the... Opps...A Three Dog Night Moment...

Hi Pat,

Just saw this post by Tom Barr, if you want to use the pH/KH/CO2 chart, I recall you have or wanted a pH controller to maintain CO2 levels. I think Tom Barr gives a really good method calibrate for your system. With a new system, I would recalibrate monthly at minimum for awhile until things are stable and you have a good feel for the system. :)

http://www.barrreport.com/showthread.php/5505-tank-yme-log-1?p=54730#post54730.

Biollante
 

pat w

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Biollante;55014 said:
Just saw this post by Tom Barr, if you want to use the pH/KH/CO2 chart, I recall you have or wanted a pH controller to maintain CO2 levels.

If I ever had (and I might have and now am having a senior moment) I've moved on to the more reliable "observe the critters and plants" method. The only reason I was asking the question above was in an effort to give myself a back check of sorts.

BTW ... The Rhizo is starting to loose ground. I'm not out of the woods yet but now it's just a general PITA as opposed to an extra strength, heavy duty PITA.

Pat