for alittle more context, I only use the little heat pad for the winter seasons, living in Northern New York the season tends to get bad some years, the red light is on 24/7 an its been like that for about a year (with replacements of course) and whenever I bring her home a couple mice, she scoops them up with no hesitation lol. The tank size i dont think will be an issue for her cause once in a while in the later hours ill see her jus out an about, maybe even to get a drink as well, an the would either proceed to sit on her hideaway or go back under it.