so I wen to check my wine in the garage (first racking after secondary fermentation) it’s been aging for a couple of weeks now. Today I noticed an oily sheen on my wine and it looked like the level had dropped a half inch from where it WAS when I racked it off. I have been checking it every couple days to make sure the airlock is good and filled with water. Does anybody know what I’m looking at here? It doesn’t smell off yet but, being a beginner I just smell new wine and wouldn’t know the difference.