I have a ~4ft male in a 48"x12"x20" tank. However, at the moment my only heat source is a bright red lamp at the top on one end. The thermometers I have installed are reading ~77-80 on the hot end, and ~73-75 on the cold end. I am pretty sure its too cold, though. These are at the very top of the tank, where the heat collects, about 15 inches above the snake. So whatever temperature he is feeling is undoubtedly cooler than this. Also, whenever I touch him inside his enclosure he feels very cold, and I never see him basking.
To help insulate the tank and keep the humidity from dropping too much, I have moist towels over the screen top. I was thinking of fitting some pieces of plexi glass to top, under the screen lid, to keep in the heat and humidity. Will that be enough on its own? I also planned to put a heat mat under the tank, but was warned that it might cause stress fractures in the glass from the moisture in the cyress mulch substrate. How else can I up the heat, without adding a heat mat? I was thinking adding another 3-4 inches of substrate, to raise the snake up to the hot-zone. Anything else?
To help insulate the tank and keep the humidity from dropping too much, I have moist towels over the screen top. I was thinking of fitting some pieces of plexi glass to top, under the screen lid, to keep in the heat and humidity. Will that be enough on its own? I also planned to put a heat mat under the tank, but was warned that it might cause stress fractures in the glass from the moisture in the cyress mulch substrate. How else can I up the heat, without adding a heat mat? I was thinking adding another 3-4 inches of substrate, to raise the snake up to the hot-zone. Anything else?