Hello, I'm new to the hobby and bought a leather coral about a week ago. The day after putting in my tank the polyps were extended and everything looked good. The last few days though the polyps have been retracted and the coral is kind of slumped over. I've read that leather corals will shed their skin periodically and that the stress caused by introducing them to a new tank can cause a shedding event. Attached are some before and after photos. My question is, is this a shedding event? And if it it is, how long should I wait before I start to get worried?