Yeah, looks like there should be some water in that small bottle.
I use a similar setup, but both of the bottles go into my "Bubble counter" bottle, so I know how much is producing each one of the two.
Like you, I have the checkvalve in the airline just outside of the tank.
One day I am going to try what SlyArgent suggests, instead of adding yeast just reuse a little of the old solution. I wonder how long you can do that... indefinitely?
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