Is this normal?

Hi all,

I am new to sourdough starters.  I decided to try one from scratch that called for 100g bread flour with 100g filtered water. Leave on counter, with feeding each day and then moving to fridge.  The first time I put out together it was looking good,  day 3 the smell was sour, I had flashback to when my kids were babies. I forgot to feed it so after the 5th day I threw it out to be safe. 

Started same recipe,  yesterday was day 2, when I went to feed it (a few hours later than what I wanted) I noticed a small pinkish line one small spot.  So I scooped it out, hopefully getting it all as I don't know what it was,  and refed equal portions. I know my flour is good. This morning however is a nice dark line of liquid. Is this normal? Do I mix before removing 100g of sister and feeding or 50g flour,  50g water? I may have added a little extra water last night, but I have never done this before and am afraid I will do something to make it go bad or get sick if using. 

I have also started a potato flake starter to compare it too which I also never made.  Fingers crossed.  I appreciate any input.