I rescued a A. Avicularia from the pet store because its conditons in its tank in the store were horrifying. When I got it home it seemed a lot happier. But I know they like there terrariums to be very humid and humidity is a big factor with these t's. So I bought a heat mate for him only to find the heat mate is meant only for glass tanks. He seems to move around a lot like hes trying to find the warmest place in the terrarium and he has never made any web as I have seen other ones do. He is in a plastic terrarium thats up on its side. Whats the best way to keep one of these humid? The hydrometer was almost in the red today. Is there something else I can do to keep the tank warm and humid? :?