That's not mold, it's foam- no need to taste or do any damn thing. That's just the tiniest bit of foam from fermentation or offgassing. Close that sucker up and wait for final gravity plus one week. Then you can package as you see fit. Looks like beer to me!
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!
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