# Re: [APD] CO2 problems (??)

```You are right.  I copied the wrong number down.  The PH was 6.2, not
7.0.  Overnight it went to 7.0, or 27 ppm, but it should have shown
about 3 ppm.  That was what convinced me that something in the water is
making the KH/PH/CO2 relationship unworkable.

The only other thing I know of that might have given me trouble with
algae was a dead fish trapped where I couldn't get it out - behind my
cork wall.  So, if you don't have an ammonia generator (dead fish) and
have enough CO2, I just struck out!  Next batter!

Vaughn H.

On Wednesday, March 1, 2006, at 04:40 PM, Barry Anderberg wrote:

> By the way, correct me if I am wrong but KH 9 and pH 7.0 yields about
> 27
> ppm of CO2.  Not 170.
>
> I use the formula: 3*KH*(10^7-pH)
>
> That means 3*9*(10^0) = 3*9*1 = 27 ppm.
>
> Or am I missing something?
>
> Vaughn Hopkins wrote:
>> CO2!!  My 29 gallon tank last tested at 170 ppm CO2 (KH - 9 and PH -
>> 7.0), with no distress to the fish.  So, I did the overnight test:
>> take a small cup of water from the aquarium and let it sit over night.
>> Then test both it and the aquarium water.  The CO2 in the overnight
>> water should show about 3 ppm, reflecting the atmospheric CO2.  The
>> difference between the two should be about 30 ppm CO2.  That will give
>> you a more accurate CO2 reading, but if the fish don't object yet,
>> just
>> increase the bubble rate no matter what the test shows.  Do that early
>> in the day and watch for fish distress.  Keep jacking it up a little
>> each day until the fish say "uncle!" then drop it down a notch.  That
>> should be the right amount of CO2 for your tank.  I finally did that
>> and my algae problems dropped off considerably.
>>
>> Vaughn H.
>>
>> On Wednesday, March 1, 2006, at 03:29 PM, Barry Anderberg wrote:
>>
>>
>>> It is.
>>>
>>> Vaughn Hopkins wrote:
>>>
>>>> Is this a 29 gallon aquarium?  You seem to have omitted that piece
>>>> of
>>>> data.
>>>> Vaughn H.
>>>>
>>>> On Tuesday, February 28, 2006, at 05:20 PM, Barry Anderberg wrote:
>>>>
>>>>
>>>>
>>>>> My city water report says my water's alkalinity, due entirely to
>>>>> bicarbonate and nothing else, is 17.5 dKH.
>>>>>
>>>>> My Aquarium Pharmaceuticals test kit confirms this number.
>>>>>
>>>>> Both Red Sea pH test and Aquarium Pharmaceuticals pH test agree
>>>>> that
>>>>> my
>>>>> pH is currently at or around 6.8.
>>>>>
>>>>> That gives me a whopping 85 ppm of CO2 in the water.  This stands
>>>>> to
>>>>> reason as I am bubbling about 3 bubbles per second into an external
>>>>> DIY
>>>>> reactor.
>>>>>
>>>>> The problem?  None of my fish are showing any stress at all, which
>>>>> makes
>>>>> me wonder if I am missing something and that my CO2 really isn't
>>>>> that
>>>>> high.
>>>>>
>>>>> As a newbie to planted tanks I'm also obsessed with getting my
>>>>> plants
>>>>> to
>>>>> pearl, and they do, every day almost all day long, but it isn't
>>>>> very
>>>>> heavy pearling like I have seen in some photos.
>>>>>
>>>>> Maybe I should try some riccia.
>>>>>
>>>>> Also I am starting to see some hair algae on the older growth
>>>>> leaves,
>>>>> especially on my ludwigia.  I thought if I kept the CO2 high and
>>>>> sure my plants had all the nutrients they needed I would be able to
>>>>> avoid this kind of thing.
>>>>>
>>>>> my tank is as follows:
>>>>>
>>>>> 100% eco-complete
>>>>> 10 total hours of lighting, 65W CF lighting with a 3 hour, 2x65W
>>>>> "mid-day"
>>>>> Water: 22 dGH, 18 dKH, 6.8 pH
>>>>>
>>>>> Aquarium Pharm. Test Kit Results (for whatever they are worth)
>>>>>
>>>>> NO3: 20 to 30 ppm
>>>>> PO4: 5 ppm
>>>>>
>>>>> I dose using the Estimative Index as follows:
>>>>>
>>>>> Sunday: 50% water change, followed by dose of 1/4 tsp KNO3, 1/16
>>>>> tsp
>>>>> K2SO4, 1/16 tsp KH2PO4
>>>>> Monday: 15 mL Plantex CSM+B mixed at 1 tbsp. per 250 mL water
>>>>> Tuesday: Same dosing as Sunday
>>>>> Wednesday: Same as Monday
>>>>> Thursday: Same dosing as Sunday
>>>>> Friday: Same as Monday
>>>>> Saturday: Nothing
>>>>>
>>>>> How can I improve my tank and get better, faster growing, healthier
>>>>> plants and stop that annoying hair algae that is starting to form?
>>>>>
>>>>> _______________________________________________
>>>>> Aquatic-Plants mailing list
>>>>> Aquatic-Plants at actwin_com
>>>>> http://www.actwin.com/mailman/listinfo/aquatic-plants
>>>>>
>>>>>
>>>>>
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>>>>
>>>>
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>>
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>>
>
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