After getting my grape juice in a bucket, I added the sugar and wild yeast killer. Didn't have the yeast to add before sealing it up. Checked the next day, it has a purple foam that collected on top. It's been a week, I should be getting my yeast in the next day or two. The bubbler(airlock) on top bubbles at least once a minute.
Should I skim the foam that might still be collected top of juice?
Or stir it in when I add the yeast tomorrow?