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Sarcophytons also reproduce by lateral fission, an area appears to become necrotic, eventually one area separates from the main colony. As long as the pieces is opening routinely, the area is not increasing at a noticeable rate and the other tissue is not turning black than I would not be concerned.
the siphon put a dime size sucker bite on it
Wow, I didnt know about lateral fission in toadstools! Very cool to learn this, thanks!
The author uses a more accurate term "auto frag".
Anyway, like many other corals, toadstools are colonial organisms that can reproduce by releasing parcels of themselves. In particular, they sometimes "auto-fragment" by dropping off bits and pieces of their own capitulum, which can readily grow into whole new colonies. While it's far less common, they can sprout bud-like projections on their trunks that can drop off and produce new colonies, as well.
http://www.advancedaquarist.com/2013/3/corals