I’ve noticed a dry layer appearing to form on the surface of our starters. What should those of us with dry tops do to best stay in line with the experimental procedure/goals?

The dry layer may be unavoidable in some cases. The only reason we would absolutely recommend discarding a dry layer is if it has a lot of (fuzzy) mold growing on it. Otherwise, just go ahead and mix it back in. We do NOT recommend a solid lid, since this might prevent colonization […]