Welcome to the forum! :)
Hopefully someone here will be able to help, but a bit more information would probably be useful. How was the tank doing before you added the coral? How are the water parameters?
Welcome to the forum :) Sounds like he could be hiding, but I understand your concern. Could you tell us more about your tank, stock, and water parameters?
Welcome to the forum @Geekysteve! :) I can understand your frustration, bet you must be keen to get on with things. I'm guessing you didn't test the water at any point between the times you mentioned in your post?