well if you keep them on frags and move them a lot then they will usually grow in a ball. but if you glue them in a good spot that they like, they will spread out all over the rocks and if you give them enough time they will spread to other rocks.
my best advice: set it and forget it. it will grow
If you're attempting to ask if they're like an LPS/SPS with a skeleton base, the answer is no. They adhere to the surfaces that are available, not really creating new ones.
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