I would take them out and put light diffuser/egg crate over the verm. Eggs are highly sensitive to being too wet or too dry. My first year I put my eggs on the substrate and got them too wet, I got them off the substrate after 2 weeks, but 4 of the eggs died between that time and when they were supposed to hatch. The rest of the babies were too deformed to make it.
Also, when you say wire mesh, what are you going to use? Metal will rust.