Doesn't like Kool-Aid
Join Date: Feb 2003
Location: Hawthorne, New Jersey
Very true, Belvedere.
The question at hand isn't pearling in general, but the high rate of "pearling" after a water change.
Tommy and Ian provided the answer. The new water is saturated with ox yen, and as that oxygen works its way out of solution it collects on the leaves of plants.