I have one of these, Amazon.com: Exo Terra Glass Terrarium Small/Tall, 18 x 18 x 24 Inches: Pet Supplies and the same problem of crickets escaping. I put duct tape around all seams on the lid, and the vent things along the front and back. The crickets are escaping from EVERYWHERE. I didn't have a single square inch of tap that wasn't covered with small cricket carcasses.