CO2 question

**ryantube** · 02-14-2013, 06:57 AM

What is the range of CO2 (in ppm) that is good for plants?

Darkblade48 · 02-14-2013, 08:15 AM

Usually, people aim for approximately 30 ppm of CO2.

**Hoppy** · 02-14-2013, 08:59 PM

As far as just the plants are concerned, you can use 100 ppm of CO2 and they will be happy. But, the fish will be dead. The limit is based more on what the fish can live with than what the plants need. The more dissolved oxygen you have in the water, the more CO2 the fish can live with. The more light you have, the more CO2 the plants need to grow as fast as the light is forcing them to. With low enough light, the plants can grow with just what CO2 dissolves into the water from the atmosphere, but more CO2 will make the plants grow faster and more healthy.

**ryantube** · 02-15-2013, 12:34 AM

Atmospheric CO2 is 395.55 ppm. That explains why Fish can't survive out of water and ppt grow plant emersed. LOL

http://co2now.org/

**Hoppy** · 02-15-2013, 01:45 AM

Quote:

Originally Posted by ryantube

Atmospheric CO2 is 395.55 ppm. That explains why Fish can't survive out of water and ppt grow plant emersed. LOL

http://co2now.org/

The last time I checked, water was a lot heavier than air.

02-14-2013, 06:57 AM	#1
ryantube Planted Tank Obsessed (View User Tanks) PTrader: (44/100%) Join Date: Jan 2012 Location: Alhambra, CA, USA Posts: 340	CO2 question What is the range of CO2 (in ppm) that is good for plants?

02-14-2013, 08:15 AM	#2
Darkblade48 Moderator (View User Tanks) PTrader: (3/100%) Join Date: Jan 2008 Location: Toronto Posts: 7,043	Usually, people aim for approximately 30 ppm of CO2. __________________ Anthony A Primer to Pressurized CO2 and A Primer to Planted Tanks Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Ehein 2217, Eheim surface skimmer and Eheim autofeeder. Victor Pimp #33 - HPT272-125-350-4M

02-14-2013, 08:59 PM	#3
Hoppy Planted Tank Guru (View User Tanks) PTrader: (52/100%) Join Date: Dec 2005 Location: Sacramento, CA Posts: 17,198	As far as just the plants are concerned, you can use 100 ppm of CO2 and they will be happy. But, the fish will be dead. The limit is based more on what the fish can live with than what the plants need. The more dissolved oxygen you have in the water, the more CO2 the fish can live with. The more light you have, the more CO2 the plants need to grow as fast as the light is forcing them to. With low enough light, the plants can grow with just what CO2 dissolves into the water from the atmosphere, but more CO2 will make the plants grow faster and more healthy. __________________ Hoppy

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02-15-2013, 12:34 AM	#4
ryantube Planted Tank Obsessed (View User Tanks) PTrader: (44/100%) Join Date: Jan 2012 Location: Alhambra, CA, USA Posts: 340	Atmospheric CO2 is 395.55 ppm. That explains why Fish can't survive out of water and ppt grow plant emersed. LOL http://co2now.org/