This has to be my favorite coral in my tank, it gives tons of movement to my tank along with providing excellent color, and it seems to be a rarity among reefers due to their survivability rate.
I put difficult to keep because goniopora tend to be a rent a coral, I have heard tons of stories of them melting out of the blue one day, has to do something with disease or something I am not quite sure but I also have heard they like dirtier water I am not sure.