Im looking for aquarium rocks/sandstone for my Frontosa's set up, I dont want pebble shaped pieces, as they arent stable enough for my liking piled up, but more like long 6-7" upwards, 1-2" think sandstone or similar, Ive been round pretty much every DIY place, garden centre in my area, cant find any in local LFS, looked on ebay but they seem to be sharp edged pieces that come in small sizes which arent alot of use, I need smooth edged thick pieces, anyone know of a web site to get these??