2 aquariums off 1 co2 tank - The Planted Tank Forum
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post #1 of 17 (permalink) Old 01-28-2012, 03:58 PM Thread Starter
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2 aquariums off 1 co2 tank

im planing on doing co2 injetion on my 29 gallon but i dont know how to go about conecting another line to the tank.

the second tank is almost 15 feet away from the first but i could run a line behind the wall

im using a red sea duel stage regulator and needle valve
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post #2 of 17 (permalink) Old 01-28-2012, 04:16 PM
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Sounds like a plan! You'll just go through your CO2 charge twice as fast. One suggestion would be to purge your 15' line before you hook onto your diffuser / reactor (throw the valve wide open and blow out the line for a minute). Otherwise you'll be bubbling air instead of CO2 for the first day or two.
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post #3 of 17 (permalink) Old 01-28-2012, 04:31 PM Thread Starter
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i guess i should try to explain a bit better what im looking for. What kind of a spliter do i need to run? my needle valve right now is an inline valve not atached to my regulator so im asuming i need to some how split the line before the needle valve and add a second one for the second tank right or wrong
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post #4 of 17 (permalink) Old 01-28-2012, 04:38 PM
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More than likely you are going to need another needle valve, or at least some other way to control the pressure individually. It's possible that you may be able to meter them individually after the needle valve with some decent aquarium gang valves, but I can't say for sure if the ones you get at the LFS are able to handle 10-15 psi which is what most of us are running at. Without individual control you will be getting different flow rates in each tank.

*more brainstorming*

Thinking more on this, I don't think it necessarily means that there's 10-15 psi after the needle valve. I also think it will depend on your diffusion method in each tank. If you are using something that requires the high pressure like the ceramic/glass diffusers I think you will definitely need a second needle valve. If you are using a low pressure diffusion, like the red sea 500 or something, I think you could use the gang valve idea after the needle valve. Keep us posted on what you find, as I'm interested in the outcome myself.
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post #5 of 17 (permalink) Old 01-28-2012, 04:42 PM
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here you go, it's a crude diagram, but is this what you're trying to do?

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post #6 of 17 (permalink) Old 01-28-2012, 04:46 PM Thread Starter
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i was thinking that i need the spliter right off of the regulator then a needle valve to each tank followed by a bubble counter for each tank aswell. my main issue is exactly what you stated im not sure what type of splitter to use
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post #7 of 17 (permalink) Old 01-28-2012, 04:48 PM Thread Starter
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Originally Posted by proaudio55 View Post
here you go, it's a crude diagram, but is this what you're trying to do?

thats what im trying to do just looking for what type of splitter
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post #8 of 17 (permalink) Old 01-28-2012, 05:37 PM
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I know GLA has multi outlet manifolds, but I don't think he will sell it by itself. I'd go to your local hardware store and look for a T fitting that will hook inline. I'm pretty sure that you can find something. I saw all kinds of stuff when I was hooking up my system.
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post #9 of 17 (permalink) Old 01-28-2012, 05:47 PM Thread Starter
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I know GLA has multi outlet manifolds, but I don't think he will sell it by itself. I'd go to your local hardware store and look for a T fitting that will hook inline. I'm pretty sure that you can find something. I saw all kinds of stuff when I was hooking up my system.
wold any brass T or Y fitting work followed by a needle valve
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post #10 of 17 (permalink) Old 01-28-2012, 05:49 PM
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Quote:
Originally Posted by proaudio55 View Post
here you go, it's a crude diagram, but is this what you're trying to do?

This is the easiest way, but fluctuations in the diffuser for one tank are going to effect the other tank. The only way to get them independant is adding a 2nd regulator. That being said, unless one diffuser is clogged or something, its probably not a big deal.
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post #11 of 17 (permalink) Old 01-28-2012, 06:12 PM
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wold any brass T or Y fitting work followed by a needle valve
In my opinion, it should be just as usable as any other fitting in-line with the system. As long as it's not leaking it should work.
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post #12 of 17 (permalink) Old 01-28-2012, 06:16 PM
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Yep, I use brass on my regulator, it's never been an issue. If the brass is soaking in aquarium water all the time it might shed a little Cu into the water. With gasses, that's not going to happen.

(This is my DIY 2 stage regulator)
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post #13 of 17 (permalink) Old 01-29-2012, 01:41 PM
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For a long run of tubing like this, I'll state the obvious; use co2 impermeable tubing!

create random acts of beauty...
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post #14 of 17 (permalink) Old 01-29-2012, 02:09 PM
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If you're using the same diffuser/reactor in both you won't need a second reg, I think the design looks fine. As long as your line pressure (between the reg and valves) is marginally higher than the operating pressure required by the diffuser/reactor, fluctuations in one will have no impact on the other - the exception being a free flow in one of the lines, which is not a normal occurrence.

+1 on line purge (sound practice regardless of line length)

+1 on CO2 impermeable tubing (again, I'd say that works for any length)
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post #15 of 17 (permalink) Old 01-29-2012, 02:38 PM
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Can you find one of these in the US? It would be perfect for you, the following site is a shop in Hong Kong.

http://www.fishmanshop.com/products/...co2/G-515.html



Some shops in HK use 6+ splitters for multiple planted tanks, like this: http://www.fishmanshop.com/products/.../AQUARIUM.html
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