- Material: Silicate aggregates.|$|- Visually appealing mean of enhancing the appearance of your fish tank.|$|- Suitable for all types of aquarium set-ups including coldwater, tropical and saltwater.|$|- Effective planting medium due to its finer size.|$|- Increased surface area allows for improved anaerobic activity.|$|- Will not change the PH of the water.|$|- Pre Cleaned and color fast.|$|- Size:18lb.|$|- Gender: Unisex Adult