Our conversations about solving this problem inspired me to post a blog update about the situation, with brand new pictures of the mycelium
growing through spent beer grains and coffee grounds. A fair amount of darkish, digestive liquid is being generated. I thought I saw a small spot of contamination,
so I tilted one of the jars to pour some of the digestive liquid on it. The spot seems to have disappeared under a renewed growth of mycelium.
I am even experimenting with growing mycelium through the soil of my house plants (also added with spent pop sickle sticks and coffee grounds) picture below with another pic of the spent beer grains being overtaken.
I've found that a natural plant overgrowth (ground cover-style plants) help act as a protective barrier for the mycelium.
Thank you so much, guys!
Please, check out the update and my other amateur experiments with homesteading and permaculture: