CO2 for Aquarium Plants? - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > CO2 for Aquarium Plants?

Thread Tools
Old 02-14-2013, 05:31 PM   #1
Aug 2010
Boise, ID
Posts: 4

Has anybody connected their fermentation lock to their fish tank? I grow plants in my aquarium and would like to introduce CO2 to promote growth. Pressurized CO2 systems cost money, and primary fermentors make CO2. Just thinking out loud here...

Reply With Quote
Old 02-14-2013, 06:23 PM   #2
Jan 2010
Posts: 119
Liked 14 Times on 13 Posts

I was into planted tanks years ago and used CO2 bottles, but reading on message boards like this I saw some aquarists used to ferment sugar water in 2L bottles and pipe the CO2 into their aquariums. thing is they had to keep tabs on when CO2 production was slowing and get another batch going. I imagine it would be similar.

FWIW, I'm using the same regulators and CO2 equipment for kegging and force carbing that I used on my planted and reef aquariums.

Reply With Quote
Old 02-14-2013, 06:40 PM   #3
Mar 2008
Catonsville, Maryland
Posts: 119
Liked 20 Times on 13 Posts

Seems like the co2 output from a batch of beer might be very high for a very brief period of time, and therefore not very helpful. You don't want to gas your fish, or have the co2 levels fluctuate so much.

However, you certainly can add co2 to an aquarium by fermentation. Google diy co2, or search threads on a forum like

Before I went pressurized, I used diy co2 on my 29 gallon and my 20 gallon, and it worked quite well. I still use diy co2 on my 2.5 gallon nano tanks.

Reply With Quote
Old 02-16-2013, 03:53 AM   #4
Jan 2012
Posts: 75
Liked 7 Times on 6 Posts

I did the DIY co2 as well. Sugar water in a bubba keg piped and defused in. You can use co2 out of a tank the biggest thing is the injection into the water. Bubble counter is the easiest to keep track. Just remember when you turn off your lights the plants will stop taking the co2 in. So you can gas your fish at night. Proper co2 balance or turning the co2 off at night will prevent this.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Are these hop plants? Faub007 Recipes/Ingredients 5 09-28-2012 02:44 AM
hop plants Firebat138 Hops Growing 2 02-28-2012 09:41 PM
Hop plants kerant Recipes/Ingredients 1 01-27-2012 03:06 PM
New Plants..... 2BeerSpeer Hops Growing 17 12-09-2011 01:38 PM
My Sad Plants ChrisS68 Hops Growing 4 06-17-2008 04:04 PM

Forum Jump