i have two ball pythons which are both doing great but seeing as how they are almost 4 feet in length i have discovered a problem. i always have a water bowl in the tank (of course) but they seem to always knock it over leaving this great mildew smell. yuck! i need ideas on a 1 a heavier bowl, or 2 a bowl with some sort of suction cups on it so they can't knock it over. thanks in advance for any advice!