Newbie Question on co2 and o2 - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 11-09-2006, 02:06 PM Thread Starter
 
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Newbie Question on co2 and o2

Hi All,

A bit of a newbie question for you all. Ive started a 20 gal high tech planted aquarium. Current setup is 72 watt PC, pressurised co2 and internal filter. No live stock.......fluctuating ph before pressurised co2.



ph 6.8
am 0
nitrite 0
nitrate 5
kh 110ppm
co2 29 ppm

My question is........ how do I know if there is enough disolved oxygen and also how can I keep PH fluctuations to a minimum at night etc.

Thanks,

Last edited by ianmason; 11-09-2006 at 05:52 PM.
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post #2 of 7 (permalink) Old 11-09-2006, 02:33 PM
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If you're running the CO2 on a timer only, there is no way to control the fluctuations in Ph. I have had my system that way for a long time. My Ph drops almost a full point over the course of the day when the CO2 runs. The fish and plants don't seem to notice at all. I think it's because it's such a gradual change. I wouldn't worry about it too much.

Tommy

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Red Turquiose Discus, Japonica shrimp, assorted Blue Eyed Rainbows, Tetras, Hatchets, Danios, Rasboras
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post #3 of 7 (permalink) Old 11-09-2006, 03:32 PM Thread Starter
 
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just read on another post that if my plants are pearling it means there is full o2 saturation?? if not then the o2 that the plants are giving off is disolving instantly into the water??

Have I got this correct??
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post #4 of 7 (permalink) Old 11-09-2006, 05:53 PM Thread Starter
 
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any ideas?
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post #5 of 7 (permalink) Old 11-09-2006, 06:25 PM
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Just for general info, the solubility of gases in liquids is related to temperature and pressure.

So, if your tank heats up, this could result in gas bubbles appearing.
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post #6 of 7 (permalink) Old 11-09-2006, 06:37 PM
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Quote:
Originally Posted by ianmason View Post
just read on another post that if my plants are pearling it means there is full o2 saturation?? if not then the o2 that the plants are giving off is disolving instantly into the water??

Have I got this correct??
If you think about this some more - assume a plant is growing slowly. It will "exhale" O2, but at a slow enough rate that it all dissolves into the water. But, assume it growing very rapidly. It may then be "exhaling" O2 at such a rapid rate that, given the low soluability of O2 into water, the water won't dissolve it as fast as it shows up, so a bubble appears. That would suggest that it is the rate of growth of the plants that controls how much pearling you see, more than the saturation of the water with O2.

Hoppy
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post #7 of 7 (permalink) Old 11-10-2006, 08:10 AM Thread Starter
 
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Thanks for your input hoppy and co........
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