So my sourdough starter is about two weeks old, but it suddenly stopped growing three days ago (after a couple days of very active growth)and developed a brown layer on top.The layer is mostly brown with about 15 percent of it being normal starter. Most of what I researched is that it is hooch, but the brown layer is more solid (the same thickness as my starter) and isn’t separate from the top layer of the normal starter. I have been keeping my starter in the oven with just the light on. As for my feeding schedule, I feed it 1 cup of AP Flour and 1/2 cup of water every day. If anyone has an answer, please let me know; it would very helpful.

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Your starter is drying out. Don't keep it in the oven with the light on. It's been too warm.

Depending on your comfortable room temperature, you should be able to leave it on a kitchen counter top. You should have a lid or other covering on it, too.

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  • Thank you! I will leave it out and see what happens. – Pandai Jun 2 at 18:02

Dried yeast and dead microbae. The recipe I follow tells me to discard the upper layer with every feeding and get 50g from the lower fresh layers, add 80g flour and 50g water.

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  • Thanks for identifying what it is. Hopefully this doesn’t present an opportunity for bad bacteria to dominate the starter. – Pandai Jun 2 at 18:03

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