I was going to use plexiglass on top of my mesh lid that I have for my hermit crabs. I currently have a reptile hood with 2 bulbs one for day and one for night. My question/s is if I put plexiglass over the whole top will it melt or crack? Also will the heat be able to get through the plexiglass to warm up the tank? I have plastic wrap and packing tape on there now, and was wanting to use the plexiglass to hold humidity a bit better. thanks in advance!