Hi guys. Im intrested on making a cave in my aquarium. Or anything like hidden spot for my livestock. Prefer cave more but i dont know how to make it.. If Using rock how to put a soil on my cave since i wan put a carpet plant on it. Or it just cover up with fern or something like that.. I've no idea.. Any suggestion or idea or any link on how to make it are most welcome guys.. Thanks yaaa! Here is some idea that make im really intrested..