Im somewhat new to sourdough starters. I have been using my starter for about 6 months, baking bread every 5 days or so with great success. It seems my starter has grown what looks like a SCOBY. No black or green- Its the diameter of the crock i keep it in. Looks exactly like a scoby. Everything smells appropriate. Is this normal? Ive been searching and havent found any explaination.