The lfs sold me a beautiful coral about 2 months ago. Up until now, it has done wonderfully. The lfs and I debate if it a "torch" or a "hammer" coral. It has at least 6 stalks and when expanded it looks about the size of a softball. About 4 days ago, one of the stalks started to not expand. I have checked, and nothing seems to be lodged in the stalk. All water parameters are normal and temp is 80 degrees. Any help would be appreciated.