So i bought this acan 3 days ago and it hasnt opened up all the which i wasnt worried about because i know corals take little time to adjust but to i came home and it is starting to die off. My water is perfect, my sps corals are growing like crazy. At first i thought it wasnt opening because of the lighting(54w par 38) so i moved the fixture up about 4 inches and aimmed it so it wasnt pointed directly at the acan that didnt help. so ow i have it down in the sand in a bit of shaded area that gets medium to high flow. Any advice would appreciated. thanks