Sinularia might be intricately folded up in it's shipping bag. Like for all other specimens: the adaptation period from bag to tank should be made in white plastic container to be able to inspect it for parasites. Always under strong lighting. Adding an air diffuser will allow it to remain in pail for a whole day if needed allowing it to unfold. Don't forget to wear gloves !! They become large showpieces (24 inches) and are spectacular !!
Sylvain Beriault at SBMarine (sbmarin.com)