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Most calcium carbonate deposits are made up of the skeletal remains of marine plants and animals that have fallen to sediment on the bottom of shallow seas after their death. If the conditions are right, these sediments can build up over geological time to form extremely thick layers.
LPS and SPS are stony corals. Soft corals, like xenia and anthelia, generally do not have a calcium carbonate skeleton (there are a few exceptions, however). Instead, they contain needle-shaped pieces of calcium carbonate called sclerites.