Please help: my starter seemed to be doing great for the first few days. It was rising, bubbling and smelled good and yeasty. I was feeding it accurately weighed amounts of flour and warm water using a digital scale. Then, after a feeding in day 5 it failed to raise. It's now day 10, I've been refreshing it every 24 hours. The starter is not reacting much. It's starting a firm lump. There are a few bubbles that I can see through the bottom of the glass bowl and the top has a light grey film that I scraped off before measuring out my starter to use in the refresh. But it's not raising. Should I scrap it?

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