Okay I'm fairly sure I know the answer to this, but it's just a guess. I did a fairly large water change just a moment ago and after I filled my tank back up a few plants started pearling. Now I'm assuming that the plants aren't really pearling but that it's some air that has gotten into them from the water change. Am I correct? Btw nothing has ever come close to pearling before, diy CO2 just isn't enough in my tank. Oh and no it's not just micro bubbles I mean a steady stream of air from one place. Just curious anyhow 
Chris
Chris