All other livestockCommon Name: Bio Rock Scientific Name: Bio Rock Size Various - 12-15kg How long have you had it? Few days Shipping or Collection only: Collectipn Your location. Johannesburg Northen Sub's Price: R40 p/kg Photo's: IMG_7542.JPG Notes: Have some left over Bio rock, paid about R55 p/kg asking for R40 p/kg. There a a few big pieces (in pic) and more smaller pieces. Currently got it in some tank water.