Black Venom Stones

WIO Black Venom Nano Boulders are gorgeous dark grey rounded stones that become shiny jet black when wet. These look brilliant when used with WIO Black Venom Gravel or white sand. May ever so slightly raises the pH level of aquarium water. Boulder sizes up to 10cm.

Please note: Due to these being a natural product, size, shape and colour will differ from box to box. Pictures are just an example.