Would this be ok? We are going to pick some up on Sunday: http://www.petsmart.com/product/index.jsp?productId=2753227&cp=2767036.2769124&fbx=0&fbn=Type+1%7CGravel+%26%23038%3B+Stones&f=Taxonomy%2FPET%2F2769124&f=PAD%2FType+1%2FGravel+%26%23038%3B+Stones&fbc=1&parentPage=family&keepsr=1