This morning I found flour beetles in the bottom of the feed bag. I'm fairly sure it's from me and not the store. I do keep my feed outside in an old chest freezer - actually it's a brand spanking new freezer that the motor/ refrigeration parts were damaged in shipping so it seals well. I cleaned it all out but would like to put some Diatomacious (sp) Earth in the bottom before putting more feed in. I just wasn't sure if it would be effective against something like a beetle with a hard shell any suggestions ?