I bought this coral about 2 weeks ago as my first coral and everything has been doing fine. I did my first water change with it in the tank today and for some odd reason half of it wonít open... I tested everything that I have test kits for and it all seems normal and nothing has changed, PH was at 7.8 but added some stuff in and now itís at 8.1. Nitrites 0 Ammonia 0 Nitrates 0 Calcium400 Phosphates .25 Salinity 1.025. Any ideas??? I did the water change at around 12, left the house and came home to it still kinda closed. Iím leaving for vacation tmro morning at 5:30 am so any comments will help!!!