DIY CO2 questions - The Planted Tank Forum
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post #1 of 22 (permalink) Old 09-29-2013, 02:53 AM Thread Starter
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DIY CO2 questions

I've got a 20 gallon long aquarium that I'm hoping to set up with DIY CO2. I have all of the necessary equipment (diffuser, airline tubing, check valves, and suction cups), but I'm wondering what else I need. Also, how much of the yeast/sugar/water mixture would I need for a 20 gallon?

Thanks!
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post #2 of 22 (permalink) Old 09-29-2013, 04:00 AM
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Quote:
Originally Posted by sombrerobanana View Post
I've got a 20 gallon long aquarium that I'm hoping to set up with DIY CO2. I have all of the necessary equipment (diffuser, airline tubing, check valves, and suction cups), but I'm wondering what else I need. Also, how much of the yeast/sugar/water mixture would I need for a 20 gallon?
S
Thanks!
It's all the same you should be good with the standard mix. 2 cups sugar 1/2 tsp yeast 1 tsp baking soda. I have a 37 gal I'm good with one 2 liter for a month. My plants doubled in size in 2 weeks when I started with DIY co2. I use 1 cup of brown sugar with 1 cup of white sugar. I use really warm water until the sugar is dissolved, then when the sugar is dissolved I take a cup of the sugar water and mix in the yeast while its still warm. This activates the yeast quicker. Then comes the baking soda, pour it all in to a 2 liter bottle and shake. I usually get bubbles in 45-60 minutes. Good luck!

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post #3 of 22 (permalink) Old 09-29-2013, 06:35 PM Thread Starter
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Originally Posted by dex14 View Post
It's all the same you should be good with the standard mix. 2 cups sugar 1/2 tsp yeast 1 tsp baking soda. I have a 37 gal I'm good with one 2 liter for a month. My plants doubled in size in 2 weeks when I started with DIY co2. I use 1 cup of brown sugar with 1 cup of white sugar. I use really warm water until the sugar is dissolved, then when the sugar is dissolved I take a cup of the sugar water and mix in the yeast while its still warm. This activates the yeast quicker. Then comes the baking soda, pour it all in to a 2 liter bottle and shake. I usually get bubbles in 45-60 minutes. Good luck!
Thanks!
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post #4 of 22 (permalink) Old 09-30-2013, 05:03 PM Thread Starter
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Okay, got some new questions. I set up the system, and the bottle is producing CO2 (I can feel the pressure when I squeeze the bottle), but nothing is coming out of the diffuser. I put hot glue around where the airline tubing goes into the cap, and every other connection is a very tight fit (the airline tubing going into the cap was too, just wanted to make sure). Any ideas?
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post #5 of 22 (permalink) Old 09-30-2013, 05:10 PM
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How long has it been setup? And how far down the tank is the diffuser?

The whole system has to build up pressure. And if you have the diffuser too low in the tank the diy might not be able to build up enough pressure to overcome the water pressure inside the tube.

Also, is any air escaping the threads on your bottle?
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post #6 of 22 (permalink) Old 09-30-2013, 11:09 PM Thread Starter
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Originally Posted by edstewart5 View Post
How long has it been setup? And how far down the tank is the diffuser?

The whole system has to build up pressure. And if you have the diffuser too low in the tank the diy might not be able to build up enough pressure to overcome the water pressure inside the tube.

Also, is any air escaping the threads on your bottle?

I set it up around 24 hours ago. The diffuser is about halfway down the tank. I'll put it near the top and see if anything changes.

I don't think any air is escaping, because when I squeeze the bottle, it feels like a fully-pumped basketball or something. There's definitely a lot of pressure.
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post #7 of 22 (permalink) Old 09-30-2013, 11:12 PM
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When you squeeze the bottle does bubbles come out of the diffuser?
What diffuser are you using?
If you remove the diffuser can you get bubbles out of the tubing?
Some diffusers take a lot of pressure to run. While it could be possible to get bubbles out of them they cause the system pressure to go up and any suspect joints could leak. Next would be to soapy water test all your joints for leaks.
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post #8 of 22 (permalink) Old 10-01-2013, 01:37 AM Thread Starter
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When you squeeze the bottle does bubbles come out of the diffuser?
What diffuser are you using?
If you remove the diffuser can you get bubbles out of the tubing?
Some diffusers take a lot of pressure to run. While it could be possible to get bubbles out of them they cause the system pressure to go up and any suspect joints could leak. Next would be to soapy water test all your joints for leaks.
No, no bubbles come out.

This This
is my diffuser.

Yes, bubbles come out when I take the diffuser off. What should I do? Should I get a new diffuser?
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post #9 of 22 (permalink) Old 10-01-2013, 02:23 AM
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DIY CO2 questions

Can always take the simple route and put bamboo/makeup applicating pad (not a used one) or cigarette filter in the end of it. See if that works while you wait to order another diffuser.

And if it works well, I don't see why you couldn't keep it that way.
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post #10 of 22 (permalink) Old 10-01-2013, 02:47 AM Thread Starter
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Originally Posted by edstewart5 View Post
Can always take the simple route and put bamboo/makeup applicating pad (not a used one) or cigarette filter in the end of it. See if that works while you wait to order another diffuser.

And if it works well, I don't see why you couldn't keep it that way.
Would a cotton ball work?
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post #11 of 22 (permalink) Old 10-01-2013, 06:40 AM
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Why not get a gush nano belle, I used one on my diy setup and it worked wonders compared to my power head and bamboo etc I tried, never lost any co2

must....have.....more....moss n shrimp!!!!!!!!!!

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post #12 of 22 (permalink) Old 10-01-2013, 06:44 AM
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DIY CO2 questions

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Originally Posted by sombrerobanana View Post
Would a cotton ball work?
Cotton ball would probably fall apart. I went the applicator pad route. Was like $1.50 for 6 of them at the store. And each one gets cut up into tiny pieces.

But, I also wouldn't suggest that being your permanent method. Maybe use it until you find a better way to diffuse the CO2. With the small amount you get with DIY vs Pressurized already, a bad diffusion method doesn't exactly make it better.
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post #13 of 22 (permalink) Old 10-01-2013, 12:55 PM
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Sounds like you have a leak. I think hot glue is to rigid, use aquarium silicone. Its much more flexible. Make sure you put silicone on both sides of the cap. The diffuser I use is a syringe stffed with cotton,under a bell to trap the gas. It works well.

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post #14 of 22 (permalink) Old 10-01-2013, 03:32 PM Thread Starter
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No leaks, just not enough pressure for a ceramic diffuser, I guess. I'll look into buying one of those Belle Nano diffusers. Looks pretty cool.
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post #15 of 22 (permalink) Old 10-01-2013, 05:07 PM
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Originally Posted by sombrerobanana View Post
No leaks, just not enough pressure for a ceramic diffuser, I guess. I'll look into buying one of those Belle Nano diffusers. Looks pretty cool.
Had to have had a leak or you would have blown something up. Might not be as bad at lower operating pressures but put some back pressure on the system and you may see it.
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