I have tried using a zilla hide on the cool side of my tub, and she did not go over there or in it, she stayed in the warm side for 3 days, so i took out the zillz rock hide, and put back the other one, thats pretty much the same, and within a few hours i found her back in the cool side, as a new owner to baby ball, made me fill great... i'll try again later on, wen she gets bigger..