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more c02?

Discussion in 'General Plant Topics' started by Paul, Feb 11, 2005.

  1. Paul

    Paul Guru Class Expert

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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
     
  2. m lemay

    m lemay Prolific Poster

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    Re: more c02?

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

    Tom Barr Founder
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    Re: more c02?

    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
     
  4. Paul

    Paul Guru Class Expert

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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
     
  5. PeterGwee

    PeterGwee Lifetime Charter Member
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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
     
  6. Paul

    Paul Guru Class Expert

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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
     
  7. PeterGwee

    PeterGwee Lifetime Charter Member
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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
     
  8. Paul

    Paul Guru Class Expert

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    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
     
  9. Bill

    Bill Lifetime Charter Member
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  10. Laith

    Laith Lifetime Charter Member
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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...
     
  11. Bill

    Bill Lifetime Charter Member
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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
     
  12. ervis

    ervis Junior Poster

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    Re: more c02?

    Wow! Please advise. I've been using the table on Chuck's Aqua pages;
    http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm

    and it is way different than the DFW table. Which one is right? Anyone on the list know the source of the DFW table? Chuck lists the formula for the basis of the one he uses.

    steve bloom
     
  13. Bill

    Bill Lifetime Charter Member
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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
     
  14. ervis

    ervis Junior Poster

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    Re: more c02?

    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
     
  15. Bill

    Bill Lifetime Charter Member
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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
     
  16. Paul

    Paul Guru Class Expert

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    Re: more c02?

    Think I better check my results then.... I was using the one that was wrong :eek:
     
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