Hi! It is my first time building up a batch of sourdough starter with whole wheat flour and now it is on Day 5. From last feeding till now (~ 20 hours), it has grown more than double in size and with small bubbles (mainly can be seen from the side of the bottle). Yet, there's always a stiff darker layer on surface (not hooch). I'm wondering since the volume is accumulating so fast, could I just keep a small amount of starter from now? And do I always have to wait for 24 hours to feed it again? Is it always the case that the starter is ripe to use after 10 days?

Thank you so much !!

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