Alex R wrote:

"Jimmy" wrote in message
2. When will I notice the benifits of CO2?

You should see your plants pearl a lot more than without CO2. That should
probably start within a day or two.

Pearling occurs when the concentration of oxygen approaches and exceeds
saturation in a tank. If there are lots of fish, or the water is relatively cold
(which holds more O2), this may never occur.