Hi Mike, I'm so glad to hear your starter is up and running! I think it's fine to store your starter in the refrigertor with the gasket on the lid, but you do want to be sure that the starter amount fits with the size jar you're using. A very small amount of starter on the bottom of a big jar isn't ideal, but neither is a jar that is filled to the top, with no space for fermentation gases to accumulate. For the maintenance amount of starter we generally recommend (1 1/2 cups, 12 ounces, 339g) a quart sized jar is about right. 

Barb

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