IMO, pearling immediately after a H2O change is caused by nothing more than the fact that the water you are introducing is saturated with O2. Once you exceed the sturation point, all the O2 being produced by the plants is not absorbed into the water and they pearl. It's not "bubbling out" of the water.
Eheim Pimp #204.
58 gal planted Oceanic
Red Turquiose Discus, Japonica shrimp, assorted Blue Eyed Rainbows, Tetras, Hatchets, Danios, Rasboras
10 gal low tech planted Celestial Pearl Danio (Celestichthys margaritatus) & Emerald Dwarf Rasbora (Microrasbora erythromicron)