Substrate Fluval Bio-Stratum 1mm.

Made from 100% natural, mineral-rich volcanic soil from Mount Aso in Japan and infused with beneficial nitrifying bacteria, Bio-Stratum is specially formulated to provide immediate biological activity and maintain ideal conditions for a thriving plant aquarium. Characterized by its 1 mm powder granules, Bio-Stratum allows plants with the finest and most delicate roots to root easily in the porous substrate while absorbing a powerful combination of nutrients, minerals and trace elements that promote explosive growth and overall health.