thats a good question, i think it depends on how often you feed them, calcium levels and water quality, I have a nice candy cane coral and haven't noticed any new growth in the past 3 weeks.
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65 gallon saltwater tank, 60lbs live sand, 85lbs live rock, 2 ocellaris clowns, spotted goby, Flame hawkfish, scopas tang, numerous corals 
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