Green tooth coral

So went to a lfs today and they had a huge colony of what they called green tooth coral for sale and it was 50% off. I tried and tried to get a pic of it but it was in a deep tank and my phone wouldn’t get a et a pic of it. Kind of looked like this Attachment 177105 except lighter in color. I also noticed the coral towards the bottom was kind of a brown color like it had died or is dying and was starting to look like rock almost. Does anyone have any experience with these are they as aggressive as the websites say it is
Thanks In advance
Matt

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