I've never lost an entire colony to my hydnophora or euphyllia... the trick is to not jamb pack every square inch of your tank with coral and leave a little room for them to grow. Some of the tanks I see online make me scratch my head. I recall a 20 gal nano with more specimens in it than I have in my 120gal!
Galaxea and Platygyra are the two problematic ones in my book.
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