Advanced aquaculture ceramic reef discs are great for zoanthids, soft corals and small stony coral colonies that require a large wide base for support;Made of ceramic material;Each disc is about 1-3/4-inch diameter by 1/4-inch thick with a small round depression on one side to aid in gluing;Ceramic reef discs require no curing and will not leach anything into your water;Comes with 25-piece per box
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