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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. 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. The matt texture and natural appearance of the soil are good for shrimp breeding.