Just did my first batch of grape juice from Chile and when I went to pick up my order the person ask me if I needed yeast for the malolactic fermentation....well haveing only done kits up to this time I had no idea of what this was about....bough a tube to save me the drive back but when I got home looked it up on the net and still don't know if you should do one.....any takers on this issue most appreciated....thanks