My second batch of wine, VR Black Currant, is in its 3 gallon secondary, beginning to slow. When I transferred it, I had about 700 ml of extra which I saved for topping off after racking later on. The extra stuff has not completed fermentation yet, and I am keeping it in the fridge. Should I have put this in a smaller airlocked container to let it complete fermentation? How do you preserve extra so you don't restart fermentation later? Thanks!