I recently purchased a pretty large water bowl that covers nearly 3/4 of my pacman frog's enclosure because the humidity has been dropping pretty fast recently and I don't want him to dry out. Although I noticed that even with an overhead lamp the water in the water bowl is absolutely FREEZING. Its not even lukewarm, the water is completely cold. The temperature in the cage is reading around 78-83. Does the water in the bowl need to be warm too?