Crystal Clear Aquatics 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 20-piece per tube.
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