Natural Clay Aggregate Material: Made from natural clay sintered at high temperatures – no chemical additives, no odours, and won’t leach harmful substances. Stays stable and secure when submerged in water for long periods, supporting the health of fish, shrimp, and reptiles. Medium‑to‑Small Pore Structure: Uniform pores on the surface generate fine bubbles to enhance water oxygenation. Large central openings allow you to place small aquatic plants like moss or mini water figs – blends naturally into your ecosystem tank. Six‑Piece Set: Includes six coordinated bubbler stones. Place them in tank corners, reptile enclosure aquatic zones, or rainforest shallow pools to create layered hiding spots and visual interest. Natural Hiding Places For Fish And Shrimp: The porous structure forms tiny caves where small fish and shrimp can rest, mimicking a natural habitat. Helps improving survival rates and activity levels. Need support?：Reach out via Amazon Messaging — we’ll respond soon.