Superman said:For many people, pearling is not a goal which they set out to achive.
Plants can thrive without pearling as the o2 is diffused into the water quickly if you have high flow around the leaf.
If you wish to see pearling, try turning off the filter for a few minutes and you might see your plants pearling.
Pearling is dependent on plant growth/production of o2, o2 already in the water and flow.
Sorry I am not worried that they are not pearling, healthy plants is my first goal! The only reason I ask is that I am unsure as to if my co2 is making a difference. My DC stays green 24/7 even though I stop injecting at night and was just curious if they would ever pearl as this would obviously be a sign that my co2 is doing something.