DIY CO2 Diffuser help - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 01-19-2010, 03:28 PM Thread Starter
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DIY CO2 Diffuser help

Hey everyone, I had a few questions for you smarties

Just made a DIY CO2 system last night and was wondering whats the best way to diffuse it? I have the CO2 line with air stone going to a small gatoraide bottle that has 3 sides cut out and weighed down to the bottom of the tank.

Is this working well to Diffuse the CO2 or should I just put the air stone in my intake tube for HOB filter? Woke up this morning and my Diffuse bottle was floating from all the CO2 that was collected on the top near the cap.

Also I noticed on my "filter bottle" that 1 bubble is coming up every 2 seconds. Is this to much? I read that it needs to be 1 every 5 seconds.

My tank is a 29 gallon with a 65 watt compact and root tabs, Thinking I need to get some nutrients but still doing that research.


Please help by sharing your knowledge
Thanks and have a great day
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post #2 of 7 (permalink) Old 01-19-2010, 03:44 PM
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The method that you have outlined for diffusing your CO2 is known as passive diffusion. It is not very efficient at diffusing CO2 into the aquarium.

You are likely better off putting the CO2 output tube into the intake of your HOB filter. Be careful that your filter doesn't create too much suction (to the point that it will collapse your CO2 bottle and suck in the contents).

1 bubble every 2 seconds in a highly lit aquarium such as yours is fine. I recommend you purchase/make a drop checker so that you can check your CO2 levels at-a-glance.

Finally, with your lighting, you will need to keep on top of macro and micronutrients. You can check out the fertilization section of these forums and read up on EI dosing.

Anthony


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post #3 of 7 (permalink) Old 01-20-2010, 02:26 PM Thread Starter
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Tried hooking up the CO2 to a power head Bc I read it dissolved it well, But the current was way to strong for my fish and plants. So im thinking I will just buy a glass diffuser or something.
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post #4 of 7 (permalink) Old 01-20-2010, 03:18 PM
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often glass diffusers just don't work with DIY. Lots of other options out there.
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post #5 of 7 (permalink) Old 01-20-2010, 04:16 PM Thread Starter
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So what would you all suggest for the best absorption of CO2 on a DIY set up?
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post #6 of 7 (permalink) Old 01-20-2010, 05:51 PM
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You are likely best off just taking the output tube and placing it near the filter intake and allowing the filter impeller to chop up the bubbles.

Anthony


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post #7 of 7 (permalink) Old 01-20-2010, 08:11 PM
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A 29 gallon tank will require around 1 bbs of CO2, in my experience. I doubt that you have enough now to give you much benefit. If you are losing CO2 due to the filter, or some other device that splashes water, then you will need more CO2 bbs to keep up with that loss.

You can modify a powerhead by adding a spray bar or other diffusing device, so it doesn't generate so much water current. Then, the powerhead is a good CO2 diffuser. Here is another way to convert a small powerhead into a great CO2 diffuser: http://www.barrreport.com/showthread...east-CO2-users! With this, the powerhead flow is diffused so much it doesn't generate much current at all. When I was using this method I had very good plant growth, but since this distributes a lot of microscopic CO2 bubbles around the tank you may not like how that looks.

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