Is a DIY CO2 possible for a 125 gallon? - The Planted Tank Forum
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post #1 of 36 (permalink) Old 01-01-2012, 01:51 AM Thread Starter
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Is a DIY CO2 possible for a 125 gallon?

I have a 125 gallon planted tank with approx 3 WPG with 6700/10,000K CF bulbs.

I would like to try CO2 to give my plants a boost (anubias, vals, wisteria, crypts, dwarf baby tears, micro swords, and moneywort).

If the DIY CO2 is not really viable, what are my most economical options?

thank you,
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post #2 of 36 (permalink) Old 01-01-2012, 02:06 AM
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you would need a ton of coke bottles for a 125 gallon, and they would be a PITA to fill. Try paintball co2, costs only about $70
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post #3 of 36 (permalink) Old 01-01-2012, 02:28 AM
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Originally Posted by sjsuper76 View Post
If the DIY CO2 is not really viable, what are my most economical options?
In the long run, a full blown CO2 setup with a 10/20# CO2 cylinder would be most economical and least headache-inducing.
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post #4 of 36 (permalink) Old 01-01-2012, 02:41 AM
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I'm already leaning towards pressurized Co2 for an 8 gallon, I can't imagine how much work DIY Co2 would require for a 125 gal!
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post #5 of 36 (permalink) Old 01-01-2012, 03:52 AM Thread Starter
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Paintball CO2? any good links for this type of set up? would it be enough CO2 for a 125g?
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post #6 of 36 (permalink) Old 01-01-2012, 04:42 AM
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a paintball tank would certainly be enough, but you'll be filling it more often (quite a bit more than a 10# or 20# co2 tank. I think altogether my paintball setup was $120, which included:
a new filled tank - $30 (my old tank that I was using for real paintball expired)
CO2 regulator w/ solenoid - $63
Paintball tank CGA320 adapter - $16
Diffuser/bubble counter - $11

for such a large tank you'd probably need at least 1 more diffuser or some sort of reactor
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post #7 of 36 (permalink) Old 01-01-2012, 10:13 AM
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oh and except for the tank (purchased locally), everything was found on ebay
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post #8 of 36 (permalink) Old 01-01-2012, 01:56 PM
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I fill the paintball tank on my 30g once a month. Its $4 so it's less than $50 a year but it can be a hassle getting to the store to do it. I would figure on a 125g, you would need to do it weekly.
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post #9 of 36 (permalink) Old 01-01-2012, 03:11 PM
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I run DIY co2 on my 125g, and its doing really good.
I run 5x 2L coke bottles in a 10 gallon aquarium with a 300W heater to keep the temp at about 80’F. Heck with this and no surface agitation I almost killed my fish. Down side of adding the heater is the bottles only last 10 days.

Notice the before I just changed out the bottles and there was air in them reason why it’s not fully dissolved in diffuser
Start of heated yeast system
http://www.youtube.com/watch?v=j2N8i...2&feature=plcp

9 days later
http://www.youtube.com/watch?v=UtQFW...1&feature=plcp
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post #10 of 36 (permalink) Old 01-01-2012, 03:43 PM
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Paintball CO2? any good links for this type of set up? would it be enough CO2 for a 125g?
You wouldn't want a tiny 20 oz paintball tank for 125 gal tank. A 20lb co2 tank is your best option, then a 10lb tank as the next best option
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post #11 of 36 (permalink) Old 01-01-2012, 04:41 PM
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Quote:
Originally Posted by f22warzone View Post
I run DIY co2 on my 125g, and its doing really good.
I run 5x 2L coke bottles in a 10 gallon aquarium with a 300W heater to keep the temp at about 80F. Heck with this and no surface agitation I almost killed my fish. Down side of adding the heater is the bottles only last 10 days.

Notice the before I just changed out the bottles and there was air in them reason why its not fully dissolved in diffuser
Start of heated yeast system
http://www.youtube.com/watch?v=j2N8i...2&feature=plcp

9 days later
http://www.youtube.com/watch?v=UtQFW...1&feature=plcp
Man, I can't believe you got that kind of growth, in that big of a tank, from DIY Co2!! Now I'm seriously thinking about this in my 105 with a gallon jug or 2. I think I could fit atleast 1 in my sump. Now to find me a DIY diffuser Good job on that, that tank looks great.


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post #12 of 36 (permalink) Old 01-01-2012, 07:11 PM
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........ Now to find me a DIY diffuser Good job on that, that tank looks great.
Thanks, now i need a way to slow down the growth, Thinking about selling the smaller lights and hanging the big one.

also if you drink, I have found that the vodka bottles make great diffuser as pictured....about 95% diffusion when just co2 is in the bottle
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post #13 of 36 (permalink) Old 01-01-2012, 09:10 PM
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Without adding CO2 to the tank, the CO2 concentration just from atmospheric CO2 is probably from 1 to 3 ppm. That's not much. If you can even double that it helps the plants grow much better. That's why if you limit yourself to low light you can improve the plants situation with even one bottle of DIY CO2. Of course that's not nearly as much as the plants need, but it still helps. If I had that size tank, and I did once, I would, and did, use a 3-4 liter DIY bottle, changing it every 2 weeks, and using baking soda in the mix to stretch out the production a bit. Of course 2 bottles is a lot better.

Hoppy
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post #14 of 36 (permalink) Old 01-02-2012, 02:43 AM Thread Starter
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Guys,

Can I just use one 5 gallon jug (blue water cooler jug) and put in 5x the recipe for one 2 liter DIY CO2? Wouldn't that be the same as using five separate 2 liter bottles?
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post #15 of 36 (permalink) Old 01-02-2012, 05:15 AM
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actually 10 litters only comes out to 2.6 gallons but I do like the way your thinking..... I drink a bit so the coke bottles were easy to come by ( you know celebrating the passing of finals :P )

if i were to go with a 5 gallon jug i would go ahead and put the heater inside of it....may do that so i can have my quarantine tank back

so you would need 9x the recipe for 5 gallons
to make it easy a 5 pound bag of sugar is 11 cups
so you could make 11 litters or about 3 gallons of brew
then a good helping of yeast and you will have great plant growth
heck you could even fill the thing up with 5 gallons of water this would ensure all the sugar was converted before they died of alcohol
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