I just started my first cider which is from a pasteurized variety from the grocery store. It did contain potassium sorbate but I made a gallon of juiced apples and used it as a starter. After adding the starter I then added yeast nutrient to my five gallon batch (1 tsp per gallon). It started fermenting fine after about a day and for about a week now. I am wondering if I already messed it up by adding the yeast nutrient all at once or should I just leave it and see what happens?