On 22 Sep 2006 09:27:21 -0700, "Tynk" wrote:


There's no point in letting the CO2 just bubble to the surface, you're
probably losing about 99% that way - no bubbles should actually reach
the surface, they should disolve before they get to the top.
Use a reactor or diffuser of some kind.

Is a diffuser necessary in a smaller tank? Right now I'm running the
Co2 through an airstone, and the Ph only dropped from 7.3-7.4 to
neutral. I'm thinking maneuvering the airstone closer to the filter
intake tomorrow might be a good idea. What are some DIY mini diffuser
designs?


Wild gourami use their labyrinth to store air when the water in their
native environment is so poor that it can't hold oxygen. But their
gills provide sufficient oxygen in normal water.
Some live in little more than large muddy puddles.

Good luck
Pete

Gouramis and bettas don't "store" air in their labyrinth organs. They
use them like we use our lungs.
It's a secondary means of getting oxygen. Mainly, they get it through
the water via their gills. When it's depleated, they get it from the
surface via their labyrinth.
Now, they always must be able to get to the surface, no matter how well
oxygenated the water is, or they will drown!
This is a fact.

No signs of stress from anyone in the tank.