I've had this acanthophyllia coral for a few years now. It was originally in my nano, but outgrew that and moved to the big tank about 5 months ago. It's always been one of my healthiest and heartiest corals. Over the last week or so, it's stopped spreading out like a lava cake and has shrunk up dramatically. It doesn't look like the flesh is receding or there's any bleaching. I tried dipping it and moving it to a darker corner of the tank, but no luck. Has anyone had experience with anything like this? It's been one of my favorite corals and I'd hate to lose it.