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Old 04-22-2005, 12:42 AM   #11
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Here's the one I made and use:

http://www.qsl.net/w2wdx/aquaria/diyco2.html

The powerhead pulls water into the Python gravel vac and the CO2 is pushed into the same tube. The CO2 is churned with the water and the tiny bubbles usually come out from the bottom.

Works well... I believe I'm going to try to continue to use it with a pressurized system one day.
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Old 04-22-2005, 03:08 AM   #12
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will i need extra aeration though? see if i turn my powerhead venturi into part of CO2 setup, i lose the use of the venturi drawing in normal air to expel in the water. will the CO2 provide enough oxygen for the fish? or will i have to buy an additional venturi?
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Old 04-22-2005, 03:48 AM   #13
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As long as there are ripples on the surface gas exchange is occuring. Having said that with CO2 you want to minimise this.

If you have a heavily planted tank with sufficient light, the plants should keep O2 levels up.
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Old 04-24-2005, 04:23 PM   #14
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take a look at this...

http://imagehost.vendio.com/bin/view...pt=bidpay&sp=1

they use a venturi to break up the bubbles...since this is a commercial product...i think they have tested it out...although i don't know if normal powerheads have the venturi...and i don't know the ratings on their pump...although this pic might suggest the size...
http://imagehost.vendio.com/bin/view...pt=bidpay&sp=1
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Old 04-24-2005, 06:21 PM   #15
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thanx! that is what i initiall wanted to do
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Old 04-25-2005, 02:09 AM   #16
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Quote:
If you have a heavily planted tank with sufficient light, the plants should keep O2 levels up.
Well, the problem is that at night, plants stop photosynthesizing and start respiring, so they actually draw down oxygen levels. I think you'll be fine, I don't know your tank situation but you'd need a lot of fish and plants to drop down O2 levels to the point where the fish are suffering.

CO2, however, is denser than normal air, which could be a problem if you have zero surface agitation on your tank. A layer of CO2 forming above the water in your tank may limit the ability of atmospheric oxygen to diffuse into the water, which would be a huge problem.

What I would do is have a inlet that mixes the CO2 with atmospheric air. You are going to be sucking way more air than your CO2 reactor can produce anyhow, just mix your CO2 inlet with regular air. Then you are still aerating while you add CO2 to the tank.
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Old 04-25-2005, 08:14 AM   #17
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i have a form of surface agitator thingo. it agitates my surface. i am concerned on oxygen levels as oxygen level is what keeps my tank cool and is what helps my fish thrive in my water. you see i live in australia and it gets very hot, and even now that it is almost winter, the water temp is only 1 degrees lower than summer. in my city fish deaths have been caused from heat. i have extreme excess aeration and i can't remove it at all.
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Old 04-25-2005, 03:30 PM   #18
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Do you have filtration, or just water pumps?
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Old 05-01-2005, 07:38 PM   #19
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i have a water pump (pumps water through a filter media in the hood) and a sponge filter on t he powerhead
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