No problem. That's what we're here for. Don't put any stones or pebbles in you frogs enclosure. They can be accidentally eaten and cause and impaction which can lead to death. Even if placed beneath the substrate there is always a chance of a few making it to the surface due to these frogs being burrowers if you want some sort of bottom to put beneath the substrate buy a zilla terrarium liner. Its made like outdoor carpet and also keeps the frogs from sitting in there own pee while burrowed. No rocks of any kind.