This is my first aquarium so im pretty new to all this, about 2 months ago i added live rocks to the tank. A week ago i added a BTA, and a big stone crab came out of the rock. We didnt even know he was in there. I looked up if it was safe and seen that they eat anemone so after setting up a trap all, and him not going in we decided to take the rock out and pull him out. The anemone didnt get squished or even touched but it got scared and shriviled up. He got back to his normal self, but the next day he looks like the picture i added. Is he okay? Im scared if he dies he will kill everything in the tank