My starter is the Tartine way.

I mix it and dump it out everyday and add about 20 grams of ice cold water and 20 grams of refrigerated flour         (Flour is 50% all purpose and 50% whole wheat)

Sometimes after I dump it, it smells great- fruity, sweet, etc.  Other times it does not have that smell.

Why?

Also does is matter which flour I feed it with; All Purpose Flour or Bread Flour?

Thank you for your time.