Silica sand, a specially graded marine sand, is guaranteed to contain a high percentage of algal oolites. The algal oolites are highly porous and provide a perfect habitat for de-nitrifying bacteria. Due to their uniquely porous nature, oolites can house several hundred times more bacteria than crushed shell or calcium based rocks i.e dolomite gravel.
In simple terms, the marine sand will mature very quickly and remain relatively stable.Tropical Marine Sand should be lightly rinsed in fresh water before being introduced to the aquarium. Suitable for freshwater and marine aquariums.