so i changed my snakes water and newspaper thursday night and left out of town friday morning, well returning tonight(sunday) i open my pastels tank and i see what looks to be mildew or something growing.. it was 88 degrees in his tank and there only source of humidity is from there water bowl.. they are shedding full sheds so im not worried about humidity atm ..... has anyone else seen this and also how can i prevent this.. i changed the newspaper about once a week usually after they use the bathroom..