How fast does coral grow?
by 
Highlander is semi-retired from AB
ANSWERS: 2
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Very slow. Roughly between 4 to 20 meters every 1000 years.
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difrent corals grow at difrent rates, reef building corals such as encrusting "brain" corals can grow very slowly (0.5-2cm a year). some softer corals such as Xenia can form massive colonys (tens of metres across) in only 20-100years. many aquaculturists find some corals frustratingly slow and some grow like weeds and although look beautifull, can take over a tank in a mater of a few months! i hope i have helped answer your question
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