I'm assuming the white spots are areas of new SCOBY formation. The yeast would here be consuming the sugar and producing CO2 which the bacteria then consumes -- which is why the bubbles appear largely only in areas with white spots.
Keep us posted.
Tap: DIPA, oaked Baltic porter, XXX pale ale, dark IPA
Bottle: vanilla kombucha, oaked puh-er kombucha, blueberry kombucha,
Primary: rose hip kombucha, oaked honey and oolong kombucha, hopped kombucha brewed with green tea infused with cab. grapes