Not sure what B and Q is, but any hardware of tile store. Make sure you get ones that have a little texture to them. You don't want those shiny bathroom ones...your girl will be slipping and sliding. You also don't want one without any glaze at all because of clean up. Have them cut them to size to fit your tank. Get an extra 2 pieces in case you drop a piece while cleaning. Don't grout them in, just fit in snugly.