Yea it 100% is , the stalks look like mini ferns my tangs also love to eat caulerpa brachypus which I didn’t expect , used to be infested with that stuffAre you sure it's bryopsis? And you're feeding it? I think the reason for the original reply is that it's generally understood that CUC don't touch bryopsis. My snails, tang, emerald crab, etc have not touched this stuff.