trenac

I did... The ones in my area did not carry them, however it may differant in your area. I want hurt to check.

urville

hey i looked local too and the prices were like 99 for a 5lb tank and 88 for the regulator alone....
try this instead, last time i looked they had the whole system with a solenoid for around 136.
they have great combo specials too for around 120 or more...

www.co2-canisters.com

CAF

Here is another DIY thread from another forum

Calling Newbies: Super Simple DIY CO2 Picture Guide. - The Planted Tank Forum

envee

anyone ever used "soda stream" co2 bottles

JJJohnson

Here's a page about CO2, pH, and how to set up and even build your own pH meter:
www.66pacific.com/pH

How to make a CO2 reservoir out of a balloon and then pump the CO2 into the tank with an aquarium air pump.
http://www.66pacific.com/ph/CO2.htm

smartatlantis

this is my project www.dropshots.com/smartatlantis

snoopy

Does anyone know the room temperature that the CO2 can be produced? How could it be produced in the winter? I made my own DIY CO2 with your recipe but it does not work when my room temperature is from 12oC to 18oC (in the room temperature above 22oC, it does work)

ColdServings

Since this is stickied, but not closed, I presume posting to it is not frowned upon.

I've recently started to "upgrade" the DIY system on my 29 gal tank with new caps for the bottles based on those bulkhead fittings mentioned in the reference in the first post of the thread. I had started with just a friction fit (making the holes in the caps slightly smaller than the tubing and forcing it through so it's tight. Then I'd just built up a small mountain of silicone sealant around the tubing to try and get it CO2 tight. Result was, in the end, some bubbling coming out of the diffuser. I still think I may have been losing a lot of CO2 because two 2 liter bottles _should_, IIUC, get the Red Sea drop checker into the "green" range (or past it for that matter). But still blue and still, when I do tests using KH and pH of the aquarium water I get CO2 numbers in the 1-5 ppm range.

So I just made a new set of caps using the bulkhead fittings. "Makes an airtight mechanical seal" the DIY reference said. Put the caps on the bottles. Slid the tubing onto the barbs and--leaks like a sieve.

Now what?

ColdServings

Further investigation shows that the leak is because the silicone tubing does not fit sufficiently tightly on the bulkhead fitting nipples.

I say again, now what?

gpodio

David, try to tighten the tubing around the nipple using some fishing line or a twist tie...

Hope that helps
Giancarlo Podio