i have two yellow belly sliders in a forty gallon tankkk,, ive had them for about two yearrrss, and here for the past month the girll turtle keeps bitting everything in the tankk, she has torn off al the rubber on the heater, she is ruining it, i dont know what to do ,she ruining expensive things i have bought for them, i dont know how to make her stop ,,, PLEASE HELPP.