12-20-2009, 03:36 PM
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A fire will "snuff out" when it runs out of oxygen completely. If there's still a steady stream of oxygen, even at a low level, the fire will still burn.
In a planted tank, CO2 is still added to the water by either the fish or the air exchange at the waters surface if the Co2 level is real low. By limiting the CO2, it simply slows down the plant growth. If you want the plants to grow faster, then you'd add CO2 or Excel. I use Excel although it's important to note that CO2 and Excel are not 100% the same. But I do like the results I've had with Excel. What I've found is with the plants I chose, they grow too fast. Seems like I'm constantly cutting and replanting them. That's why I wouldn't use injected CO2. But I can certainly see the appeal if you wanted to grow more challenging plants.