acropora question?

[oilers1]

Hi there, I hope someone can help me; Yesterday was my first attemt at sps, I went to big als and purchased what look like a good species of acropora, it was a white color. I acclimated it and after about an hour I put it low bottom tank, I turned my lights on or about one hour. I just installed my new lights about a week ago. As of today I have not seen and polyps I believe that this species is dead; how can one tell if the coral is dead? I hope someone can give me some insights, I will alos leave my phone number for anyone to call me I'm in Edmonton on the southside, my name is Casaer at the number is 450-3103. thanks.