DIY Co2 in nanocube suggestions? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 05-29-2008, 10:48 PM Thread Starter
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DIY Co2 in nanocube suggestions?

Hi, I'm having an issue with Co2 injection in my nano cube. I ran the co2 line into the back of the tank, (The tank has a 3 stage filter. Water flows into chamber one through the sponges; over to chamber 2, up through a sponge, bio balls and ceramic rings; then over to chamber 3 where a pump connected to a tube expels the water into the tank.) and situated the Co2 tube at the bottom of the filter; therefore, the bubble has to travel through a sponge, bioballs and rings. This really isn't working so well. I'm slowing the bubble down, but I'm not getting the effect that I want.

Anyone have any ideas?

The pump has nothing that I could hook the tube into. Maybe I could buy suction cups and fasten the Co2 tube close to the pump's intake. I'll have to play with the pump. I don't recall the pump having a lip that I can attach a small segment of PVC to, with a drilled hole for the Co2 line. Would the pump suck the contents out of my DIY Co2 bottle?


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post #2 of 2 (permalink) Old 05-29-2008, 10:59 PM
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I have a 6 gallon nano with the same filtration set up as you described. I ended up connecting the CO2 line to an air diffuser and then inserted that underneath the the sponge in the first chamber. Because the water is flowing down and the bubbles rise, you get a counter-current which is much more efficient at gas exchange than if the bubbles flow with the water.

I also don't think the pump is powerful enough to create a vacuum that strong. If you are using a sturdy bottle that resists crumpling, there's even less chance.

Hope that helped any.

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