On Wed, 8 Jan 2003 19:27:01 -0500, "Bruce Geist"
wrote:
Is your CO2 flowing at the same rate all the time?

yes

sometime ago, you mentioned that you leave your CO2 going even at night. If
this is the case, how much PH fluctuation do you normally see during any
given 24 hour period?

6.8 during the day, 6.6 in the AM before the lights come on..

I saw an article on your site regarding constructing a wet/dry filter. I
assume you use a wet/dry filter, right? Does this sort of filtration allow
you to more easily stabilize input and outgo of CO2 in the water? I wonder
if this makes CO2 injection without a controller easier.. what is your

Possibly. In a tank with the absolute minimum CO2 loss, it's
reasonable to expect slightly higher CO2 accumulation during the
night.

I don't know that it's really necessary to maintain extremely stable
CO2 levels. In nature, it's common for nighttime CO2 levels to be
higher than daytime levels. This is a natural swing. In fact, this
natural CO2 swing might even be beneficial to plant growth. Here's a
study that found improved growth when CO2 levels were allowed to drift
higher at night:

http://www.co2science.org/journal/2002/v5n4b1.htm



Chuck Gadd
http://www.csd.net/~cgadd/aqua