Apple Starter

I've recently begun an apple starter. I let the apples sit in water and sugar for about 4 days. It was getting dark and very strong in smell. I added most of the liquid to bread flour to begin the starter. The day after it began bubbling. On the second day, however, I noticed what I thought looked like mold on top. I skimmed this off then placed it in the fridge. It has some bubbles even in the fridge and doesn't look like it has funky stuff on top. It does have a very strong apple scent.

Do you think that it is safe to continue with this starter?