Dear Barb,
My 8 week old sourdough starter, I use rye flour and sometimes wholemeal flour, has a dry looking white powdery film on top every morning. I feed my sourdough starter once a day and I dont always discard any starter when feeding it. We have been having very hot humid weather over 90 degrees most days. I have been mixing the film back into the starter. What should I be doing? Thank you

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