Marco Rocks STAX 18KG

Flat Porous oolitic limestone, cut on both sides for ease of stacking 100% natural, never any chemicals or additives Sustainably collected For Marine or Freshwater Provides stable structure and limitless creative fun Use with mortar to make open, gravity defying structures with lots of horizontal surface for attaching live corals Average size 3-5, approx. 1 thick Perfect for building a Nano scape or adding to your existing structures, reef safe and ready to go into any aquarium