Knotty Bitz

How do I make a diy co2 system for a 75 gallon tank?

Seattle_Aquarist

Hi Knotty Bitz,

Here is a link for DIY CO2. I would consider 3 - 4 of the 2 liter soda bottles should get you started. I fed my CO2 into the input of my Aquaclear HOB (hang on back) filter and used it as the diffuser. Niko, another APC member, came up with a great DIY diffuser using an inexpensive internal filter that also worked very well for me.

ngb2322

I'd check through some of the posts on here. If you are looking to do yeast reactors, you'd probably need a good two or three of them going simultaneously to get the CO2 range you're looking for. IMO go pressurized for a tank that size.

I have a 75 gallon and tried yeast reactors...they worked okay but changing all of them constantly got annoying and a little expensive (not a lot expensive just enough that I was wondering if it was worth it to keep buying all this sugar and yeast). Then I went Red Sea paintball...worked okay but having to fill up paintball containers every couple of weeks was a pain too. Finally sprung for a 20 lb. tank, regulator w/ solenoid, needle valve, and bubble counter and it is great. Again, IMO pressurized is the way to go for a 75 gallon. A little expensive to start but totally worth it in terms of ease.

TAB

I built a larger CO2 reactor out of some 4" abs, some fittings and a clean out.




just remember to use teflon tape on the clean out as they are not "air tight"

tacoman1423

thats a great diy co2 reactor/generator. I was planning to do the same thing, seeing that some pvcs can handle pressure. Now only if i can find a valve to do a complete shut off at night, these plastic needle valves always leaks.

essabee

If you are adamant, you can make anything you please. I made a system which supplied enough CO2 to a 240G, and a 145G and a 30G all under 12 Hrs. 5WPG light period and made the plants pearl throughout.

http://www.aquaticplantcentral.com/f...ter-s-diy.html

Knotty Bitz

I am thinking of getting a pressurized co2 tank. How long should a 10 lb co2 tank last in a 75 gallon aquarium going at 4 bubbles a second?

Seattle_Aquarist

Hi Knotty Bitz,

I run a 5# on a 45 gallon and 30 gallon and I get about a month between fillings.

armedbiggiet

125g with 10lb tank and 1.5 bubbles per sec... 2 years! But I am using a special reactor that do 100% to the water.