So I have two gallons of the same batch of grapefruit wine. One has developed a peculiar white ring at the top of the wine where it terminates in the neck of the jug. Anyone seen this before? Should I be concerned with it? Is it just some residual fermentation? I ask because the other is clear with no ring. I have attached pictures as well. I hope I didn’t get some kind of fungus or something. Its my first wine and it would be a shame to lose half of it.