Fluval Plant & Shrimp Stratum Substrate Fluval Plant & Shrimp Stratum Substrate – Collected from the mineral rich foothills of the famous Mont Aso Volcano in Japan. Fluval Stratum is the ideal substrate for stimulating the growth of aquatic plants in freshwater aquariums. Plant roots easily penetrate and spread throughout the substrate. This allows plants to obtain a variety of key, readily available nutrients that will surely make them flourish. The addition of FLUVAL PLANT MICRO NUTRIENTS (Sold separately) will also ensure a full complement of essential macro and micro nutrients. The substrate’s light, non-compacting, porous structure is also highly beneficial to nitrifying bacteria. It rapidly colonizes the vast porous surface, providing optimal water quality for plants. Fluval Stratum’s inherent properties will help support a neutral to slightly acidic pH, ideal for most plant species and species of tropical fish or shrimp normally kept in planted aquariums. It also provides new born shrimp with the ideal refuge. This will allow them to escape predation until they are large enough to emerge.