I recently acquired what I believe to be a toadstool leather coral for my new reef tank and I have yet to see it open up completely and I'm wondering if there may be something wrong. I've had it for about a week and in that time it stays pretty closed up. Is this normal behavior for these guys? I've included a picture of how it spends pretty much all of it's time in the tank. My other corals include a finger leather, pipe organ polyps and star polyps.