Have read this fabulous site for ages but just joined.
I made a lovely Sourdough 2 months ago. Made a few loaves and they were pretty good.
My Sourdough is stiff and I feed it each day. It never got a strange colour or odour as I have read about.
But then ....
Eeeeeek!!! I did not feed it for 3 days as kept forgetting to buy bottled water. I finally bought the water.