more c02?

Paul

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Jan 24, 2005
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I have finally got my c02 set up working properly and got the following results

Morning ph 7.2, kh 9
Evening ph 7.2, kh 8

Looks like I am getting about 2ppm drop in a day, should I add more? flow is about 1 bubble every 2 secs atm
Tap ph is 7.6 and kh is around 9

thanks


Paul
 

m lemay

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Jan 23, 2005
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Re: more c02?

Why would your Kh change overnight? If anything the Ph should change.
 

Tom Barr

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Jan 23, 2005
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Re: more c02?

Paul said:
I have finally got my c02 set up working properly and got the following results

Morning ph 7.2, kh 9
Evening ph 7.2, kh 8

Looks like I am getting about 2ppm drop in a day, should I add more? flow is about 1 bubble every 2 secs atm
Tap ph is 7.6 and kh is around 9

thanks


Paul

http://www.aquatic-plants.org/articles/khph_table/khph_table.html


Add enough CO2 to get a pH of no less than 7.4, use only CO2 to do this.
Keep it there when the lights are on.

Regards,
Tom Barr
 

Paul

Guru Class Expert
Jan 24, 2005
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Re: more c02?

I dont know, last time I checked it the same thing happened, dont know if its crappy test kits, we can only get api or hagen ones here normally, I have seen the guys in the usa use better ones, I am struggling to find them in the uk
 

PeterGwee

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Jan 23, 2005
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Re: more c02?

I think tom made a mistake... :p The pH should be kept between 6.9-7.0 during the photoperiod.

Regards
Peter Gwee
 

Paul

Guru Class Expert
Jan 24, 2005
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Re: more c02?

so do i add a little more c02? or is it ok, I am happy with this, swords have flower stem about to reach the surface and all looks good
tap ph is 7.6, I m mixing 50/50 with ro
 

PeterGwee

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Jan 23, 2005
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Re: more c02?

Paul, it really depends on how much light you have over your tank. At lower light levels, it will not be that critical but at 30ppm, nothing will be limited.

Regards
Peter Gwee
 

Paul

Guru Class Expert
Jan 24, 2005
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Droitwich, UK
Re: more c02?

sorry, should have said, I have 60 watts and its a 120L tank, an arcadia original an a marine wite tube in there atm
 

Laith

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Re: more c02?

Yes it does seem wrong, doesn't it?

At a KH of 9 and a pH of 7.0 the CO2 will be at 31.7mg/l (at 25 degrees C).

That's what I would aim for...
 

Bill

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Jan 23, 2005
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Re: more c02?

Maybe my formula is wrong? With a KH of 9 and a pH of 7.0 I get a CO2 of 27.

But I don't have the temp. in my formula so maybe that's the difference.

Bill
 

Bill

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Re: more c02?

Chuck's Aqua pages is correct.

The one for Dallas would be correct but as pointed out earlier in this thread the colum headings are in the wrong place.

Bill
 

ervis

Junior Poster
Jan 24, 2005
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Re: more c02?

Bill said:
Chuck's Aqua pages is correct.

The one for Dallas would be correct but as pointed out earlier in this thread the colum headings are in the wrong place.

Bill

I must have missed that, or the author deleted that post or something. Anyway, I contaced the DFW webmaster and they made a change to correct the appearance of the table.

sincerely,
steve
 

Bill

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Re: more c02?

Sorry Steve,

I just read back and it must have been mentioned in another thread about the chart being off.

Bill