congrats, sounds like you did just the right thing. My sun corals were healthy, but i didn't catch them open the first couple days. Then i caught them open at around 10pm (which is pretty late for me on weeknights).

To get them on an early schedule, here is what worked for me: They were used to coming out about 30 min after the lights went off. So now I've just started turning off the lights right when I get home from work (and maybe adding some phyto). After the sun corals open up (15-30 min), I turn back on the lights and feed all the polyps and leave the lights on for several more hours and enjoy the pretty bright corals. They don't seem to mind the light at all and they stay out. I hope that eventually i can do something silimar during the morning, and coerce them to stay out all (mostly) day. we'll see.