Hi Kristen, I would not save the old starter that you have collected because there may be mold present. However, you could remove a small portion from below the surface and try to get that going with twice a day feedings. Work on feeding 20g each of starter, water and flour twice a day in a clean container and see if you see any more white spots appear. This will require discarding all but 20g starter each time you do a feeding so that the starter remains well nourished. Be sure to place it in an appropriately sized jar (an 8-ounce canning jar works well for this size starter). Once your starter is rising predictably after each feeding, has a pleasant aroma, and shows no more white spots, then you should be good to go! Check out the articles I linked earlier about feeding and maintaining a smaller starter for more help working with this type of starter. 

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