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Jimmy spawned 3 quarts WBS to a casting/verm/straw mix about a week ago. The container is a window box about 9 inches wide, 24 inches long, and 9 inches deep. Substrate is about 1 1/2 inches from top of container. Jim opened the container to check on colonizaton, and saw cobweb on the surface! (Surface is about 40% colonized -- he took a peek down the side and colonization is about 80% or so overall). WTF is Jim to do to combat cobweb? He hesitates leaving the tray in the open air to reduce humidity, as he still has uncolonized substrate on the surface. He's gotten close to nowhere w/ H2O2 solution .... maybe the fridge to drop humidity? Thanks.
H2O2 is a good idea. The problem is that the substrate is not fully colonized and it's harder to fight any contam in such conditions. As you said you shouldn't give air because it is still colonizing and you can't use any light also, which could be helpful. You can use H2O2 and try fighting it but you'll probably be wasting time with a lost run. It's your call.