well its extremely light outside... i dont know what type is it. i had bought from LFS. i dont wana drill any holes for now. im planning to do something different in aquascape, float it with moss growing on side. it floats more than hlaf submerged. but if you know any other ways, please let me know. i dont wana drill coz 1 of my friend had a bad experience, he did do that but after a week or two, somehow the wood came up leaving the screw and tile up and had to re do the whole setup.