WHAT IS SPECIAL ABOUT TUNAI AQUA SOIL? A Clay substrate reinforced with abundant minerals found in lava found in JAPAN. Tunai Aqua Soil is perfect for the Fresh Water Ecosystem and essential for the Nano Shrimp Aquarium, Aquatic Plants, All Types of Tropical Fish, and Snails. TUNAI Aqua Soil Black substrates will work fine with an under gravel filter and will not soften or decompose to an unsuitable state within your tank. WHAT IS THE ADVANTAGE OF HAVING TUNAI AQUA SOIL? Tunai Aqua Soil maintains water clarity for a longer time in your aquarium tank. Contains water cloudiness and porous Tunai Aqua soil that supports the activity of aerobic bacteria and maintains water clarity for a longer time. Acts as a natural water conditioner which is an advantage for aquatic life. This Lava rock-based substrate is spherical by design, maintaining shape and structure over time. HOW DOES TUNAI AQUA SOIL BENEFIT FISH, SHRIMPS AND OTHERS? The matt texture and natural appearance of the soil are good for shrimp breeding. The smooth texture of Tunai Aqua Soil protects delicate fins, especially for Betta Tanks. Tunai Aqua Soil is a perfect fit for Freshwater plants shrimps, snails, and other bottom feeders. HOW DOES TUNAI AQUA SOIL BENEFIT AQUATIC PLANTS? Long-standing shape allows for newly budding and mature plant's root systems to grow and flourish. Allows live plant roots to easily spread and grow and ideal grain size fosters enhanced beneficial biological activity. Lowers pH/kH of the water; creates a slightly acidic and soft water environment. RECOMMENDED QUANTITY TO BE USED - Typical 12X10X12" Tank: 3 Litre (3 Bags of 1 Litre), Typical 18X10X12" Tank: 6 Litre (6 Bags of 1 Litre) and Typical 24X12X14" Tank: 9 Litre (9 Bags of 1 Litre)