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Old 03-01-2010, 11:54 PM   #21 (permalink)
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Default Re: New to CO2...ready to give up

If you are experiencing a long delay in getting co2 out of the diffuser, your check valve is likely leaking. You need a nice quality one, not the typical ones with these lower end kits.

i actually really like the penn plax one sold on ebay (http://cgi.ebay.com/STAINLESS-STEEL-...item3a57914ef9)

This one isn't actually stainless steel like they say, it is brass, but it works great.

Closer to the tank is better, so I put it right at the rim of the aquarium. Now, get CO2 Tubing. My guess is your kit came with silicone tubing. Silicone tubing will actually lose co2 and waste gas plus cause co2 to back up into the diffuser.
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Old 03-02-2010, 08:40 AM   #22 (permalink)
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Default Re: New to CO2...ready to give up

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Silicone tubing will actually lose co2 and waste gas plus cause co2 to back up into the diffuser.
I wonder how a tubing, that does not leak, can lose or waste CO2? Do you know the mechanism involved?

Thanks.
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Old 03-02-2010, 08:52 AM   #23 (permalink)
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Default Re: New to CO2...ready to give up

Hi bartoli,

It is believed by some that the molecules of the CO2 are small enough that they can "leak" through less dense tubing like silicon or less expensive plastics. Unless I was running CO2 a long distance I doubt the loss would be significant.
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Old 03-02-2010, 09:35 AM   #24 (permalink)
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Default Re: New to CO2...ready to give up

Haven't thought of it at that level. Thanks Roy.

If someone can demonstrate it, it would be very interesting to see.
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Old 03-02-2010, 09:55 AM   #25 (permalink)
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Default Re: New to CO2...ready to give up

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Haven't thought of it at that level. Thanks Roy.

If someone can demonstrate it, it would be very interesting to see.
I suppose that would be hard to quantify that but is also what I heard.

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Originally Posted by medicTHREE
If you are experiencing a long delay in getting co2 out of the diffuser, your check valve is likely leaking. You need a nice quality one, not the typical ones with these lower end kits.
I do have the black tubing but have a cheaper plastic check valve, I will be getting a brass one soon, thanks for the link.

This morning the solenoid clicked on with the light and it started up just fine. LP is holding steady just above 20 PSI so everything seems to be fine. I will be anxious and checking it for the next week or so every morning and throughout the day but I think I am through the worst.
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Old 03-02-2010, 10:43 AM   #26 (permalink)
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Default Re: New to CO2...ready to give up

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I wonder how a tubing, that does not leak, can lose or waste CO2? Do you know the mechanism involved?

Thanks.
Silicone Tubing DOES leak. Water molecules are much larger than gas, and thus do not seep. Silicone is actually one of the worst products for gas leakage. I have witnessed it cause problems.

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Originally Posted by Seattle_Aquarist View Post
Hi bartoli,

It is believed by some that the molecules of the CO2 are small enough that they can "leak" through less dense tubing like silicon or less expensive plastics. Unless I was running CO2 a long distance I doubt the loss would be significant.

I think you are putting undue skepticism into this post. There is no "thought". It is proven fact that silicone tubing does in fact leak co2(and many other gases) and that it is noticeable in the aquarium. In a short 5 foot run with two check valves, silicone tubing caused me to have 6 inches of water back up into tubing(through diffuser) over the course of 7 hours. "Standard co2 tubing" allowed none. This result is not uncommon.

Think of it very simple. Water molecules are much larger than gas molecules. Gas will look for the quickest way to dissipate, no matter what.
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Old 03-02-2010, 01:08 PM   #27 (permalink)
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Default Re: New to CO2...ready to give up

Also, the Co2 will "harden" the tubing, and make the microscopic holes in the tubing...well...less microscopic
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Old 03-02-2010, 01:27 PM   #28 (permalink)
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Default Re: New to CO2...ready to give up

Evalp - I've run many tanks with the expensive silicone co2 tubing and the cheapest hard plastic stuff from Lee's that you find in any LFS and I have never found any significant loss of co2 for any aquarium application I've ever used either for. In fact I've been using the cheap stuff on my 72g for the last year and it's worked great. I have about a 6 foot run of the tubing going to my tank. Technically the loss is happening but it's nothing to thing about or to add into the equation of getting co2 into your tank. I believe Seattle_Aquarist used the KISS term. That definitely applies here!
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Old 03-02-2010, 04:28 PM   #29 (permalink)
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Default Re: New to CO2...ready to give up

Ah, this thread is painful to read. I'm so sorry about what happened to your fish. I've never used an Azoo regulator, but I can tell you that they're all plenty twitchy - buggy - or whatever you want to call it.

For a nano-size aquarium, I'd really recommend getting a very fine needle valve for the setup. I never really liked my setup until I did that. Personally, I don't use check-valves....... dumb? Probably, but it's one less thing to worry about. It is VERY easy to kill fish with CO2.

Keep after it. It'll eventually work out.
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Old 03-02-2010, 07:25 PM   #30 (permalink)
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Default Re: New to CO2...ready to give up

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I've never used an Azoo regulator, but I can tell you that they're all plenty twitchy - buggy - or whatever you want to call it.
I too have never used an Azoo regulator. But based on what I have read on other people's experience, one should always check the low pressure when setting up an Azoo system or when comes time refilling the CO2 tank.
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