OK, I'm a newbie to creating a starter but have years ago successfully used a starter that I received.  I have a whole wheater starter going....fed it and today it had a pinkish slug on it and it smell a little rancid...in other words wasn't a pleasant smell.  Question - should I start over making a new batch since I stirred this one and it make have gone bad.  I hope this makes sense.  It did a few days ago double in bulk.  But that pinkish slug made me wonder if it had gotten too hot in the kitchen since my A/C was off. 

After stirring it down, I put it in the refrigerator.  I did take it out after 2 hours to smell it again...it smells much better but I was wondering about the pinkish slug.