I recently purchased a Marine Betta for my reef tank. It's been 10 days and I can't get him to come out and eat. I've tried all kinds of food dry and frozen. My tank has yellow tang, purple tang, six line wrasse, Malanius wrasse, diamond goby and flame angel. Doesn't seem to be getting bullied, but he won't come from behind live rock structure. Please does anyone have any suggestions for me?