Dose it depend on the type or should they open right away? I just added my 2nd coral and it was all closed up when I got in from the LFS @ 3PM yesterday took about 30-45 min to acclamate it to the tank. Then for a while the fish poked at it here and there being something new, lights were on till 9PM-ish then back on this AM @ 7AM They are still closed up as of now.
Ray
Ray