I know this sounds strange, but I was wondering if my frogs are a bit.. strange in what they like. They don't like any substrate in their enclosure. None. They like hopping around and sleeping on the plain glass bottom of the tank. I have things for them to climb on, but does this seem typical? I have tried eco-earth and they obviously hated it. Is this kind of environment bad for them? I check their moisture and such and everything seems right on. I am just wondering if this type of environment could harm them?