I bought a sun coral off the internet about a week ago. I'm a little concerned, because not only has it not opened it's polyps, it looks like it has no polyps. Is it normal when the are closed to be completly hard and encrusted feeling? There is no polyp-like look to it? I know they usually come out at night and during feeding, but no such luck. Wondering if I was completly ripped off. Thanks for your input, I'm really needing it.