My understanding is you can cut anyway you like and glue the frags to rock. Any part of it can regrow a new toadstool. From Eric Borneman's book,
"Aquarium Corals-Selection, Husbandry and Natural History",
Quote:
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"Sarcophytons are extremely "cuttable". All sections of the coral are totipotent, meaning that a slice of the colony attached by glue or banding to a substrate can reattach and form another complete colony fairly quickly."
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