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post #1 of 6 (permalink) Old 07-31-2010, 01:23 AM Thread Starter
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co2 questions

I am just starting to set up pressurised co2 and have found a 20lb. tank for it. I have 65 and 75 gallon tanks and want to run both tanks off this tank. They are pretty close together (10-15 feet) but the tank will be closer to the 75. I have 2 diffusers to use in the 75 and plan to run it through the venturi on the 2 powerheads in the 65. Here are the first questions that I have, I am sure that I will have more:
1. Can I use a regular gang valve off the tank to send co2 to both aquariums?
2. Can I use t valves to split the line at the aquariums to be diffused in the tank?
3. How much would I need to increase the co2 rate over just one tank or will I?
Like I said I am sure that this is just the start and I really appreciate your help. Thanks
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post #2 of 6 (permalink) Old 07-31-2010, 03:16 AM
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Originally Posted by K Anderson View Post
1. Can I use a regular gang valve off the tank to send co2 to both aquariums?
It depends. Some people have used gang valves with reasonable success, while others will say that you need a solenoid (optional), but definitely a needle valve for each additional aquarium you want to add to your pressurized setup.

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2. Can I use t valves to split the line at the aquariums to be diffused in the tank?
Between the needle valve and the diffusers (I assume this is for your 75g aquarium), you can use a T-valve to split the CO2 line.

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3. How much would I need to increase the co2 rate over just one tank or will I?
If you have two needle valves, then you can control the pressure independent of the pressure of the other aquarium. This is desirable, because if you only had one needle valve/solenoid and (say) your pressure is 30 PSI, ideally, under perfect conditions, you would get an even split of 15 PSI to each aquarium. However, as diffusers clog and/or other things affect the efficiency, the CO2 will tend to take the path of least resistance.

Anthony


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post #3 of 6 (permalink) Old 07-31-2010, 03:16 AM
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it's best to have 2 needle valves and 2 bubble counter to control the rate to 2 different tanks because they're different sizes. I would set it up like below
Code:
               ____needle valve__bubble counter__reactor__tank 1
co2__solenoid_|
              |____needle valve__bubble counter__reactor__tank 2


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post #4 of 6 (permalink) Old 07-31-2010, 03:35 AM
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Quote:
Originally Posted by mistergreen View Post
it's best to have 2 needle valves and 2 bubble counter to control the rate to 2 different tanks because they're different sizes. I would set it up like below
Code:
               ____needle valve__bubble counter__reactor__tank 1
co2__solenoid_|
              |____needle valve__bubble counter__reactor__tank 2
I agree. This is the only way it will work well. As I recall, GLA sells this type of setup.

Hoppy
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post #5 of 6 (permalink) Old 07-31-2010, 03:38 AM Thread Starter
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Ok, good to know that I wasn't that far off. Can you point me in the direction of a good place to buy the splitter etc. that I will need?
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post #6 of 6 (permalink) Old 08-01-2010, 01:34 AM Thread Starter
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Went with the GLA set up. Eaiser, fewer problems & better quality in the long run. Thanks for your help.
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