I bought a finger leather coral about a week and a half ago and it seemed pretty happy in the tank at first. After one week it just didn't expand during the day like normal. It had been expanding to almost twice its size during the day. It has now been four days and it is still drawn up. Does anyone know if it is just going through a normal phase or should I start to worry? My tank is only about two months old but my mushroom corals are doing great.