I have an old wine fridge that was converted into an incubator. The temps were good the whole time, steadily between 89.7-90. I think my issue was too much moisture. I had the verm with the light difuser that the eggs were sitting on. The eggs began to look dimpled, which scared me, I thought the moisture was too low so I ended up adding more. I think I ended up adding too much because the eggs molded. So once you set the box up the first time with the substrate equal weight (based on he video I saw) water and verm, where it crumbles in your hand... then you never have to change it or anything? You just add a little moisture? How often? I am terrified of blowing it again. :\