Goniopora indeed.
The longest captivity I heard of is 2 years 11 months.
It was an unwanted hitchhiker in a mangrove setup, down at this joint near Silliman University, here in the Philippines. When the grant ran nearly out, they dismantled the system, tossed all the coral into the sea, and used the remaining funds to buy a truckload of Mandy Moore CD's and videos, and premiere tickets to Star Wars: Episode I.
Mandy Moore is still extremely popular here (not as trashy as some other female pop singers), among the old and the young.
George Lucas on the other hand, has since lost all cred.
Ah yes, the gonio...
Exceedingly filthy reservoir's overflow (back to the mangrove tank proper) is where it was located. Natural sunlight, and (horge does some rough mental conversion) about 80 deg. F is all I know. No feeding. The reservoir was chock full of ascidians, small molluscs and tunicates, so maybe their larvae were feeding the Gonio.
You can maybe look ub
Rob Toonen for his opinion on Gonio husbandry. Personally I think they should NOT be sold.
horge