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I hate telling people this because exoterra make nice enclosures..the fine mesh screen they use on the top is dangerous for spiders. They get their claws caught in it..ive read a bunch of threads about it. I used one for awhile, and taped over most of the mesh on the bottom with packing tape. But that sacrifices a lot of ventilation. Its easily fixable by removing the screen and replacing I with a thin sheet of ventilated acrylic glued to the plastic frame.