Is this mold on my sour dough starter? I received the starter in early June this year. I feed 2 parts flour to 1 part well water. The flour is sometimes organic whole wheat, sometimes white flour. I keep it in the refrigerator. I feed once a week, but sometimes longer. It had been about two weeks when I opened it and saw stuff that looked like yeast granules. They are tan in color. I fed it and let it sit out for a few hours, then back in frig. I just took a look at the starter and it looks filmy, like the same thing is developing. It has a strong yeasty smell.
Is this mold? Is it still usable?
No. You are looking at "hooch", the fermented alcohol released by the yeast organisms, floating on top of the starter with little blobs of starter pushing up from the gas released below. Your starter is just fine.

Pour off the hooch and continue.