Advertisement Hi, I am constructions some terrariums and I have to make the air lids on the sides (or on the top). I don’t know what material to use for that, I have some nice hard plastic net and some metal net available. The metal net can’t be bite off but its not that nice looking and I am afraid it could rust. The plastic net is much nicer, pretty strong and easier to handle, but I am concerned if a tarantula could bite that off and escape. I never seen them using their fangs to bite something off like rodents, but I am not sure about that…what do you think? Also, how big should the air openings be?