Trumpet Coral Issues Help Please....

I have been having my Trumpet Coral for about 4-5 months and have noticed that from time to time they would recide in and not be poofed up in a few day would return to looking normal. well this time they recided in and it been 6-7 days and not returned to normal but there is no signs of white on them but can see the bone struct them and there is still color of flouresnt green on the heads when i switch the lighing at night time. Is this aproblem or am i just over cautious

 

it requires good light and med flow in a 45% angle to the lights and feed the coral when lights out, it loves to eat, cal and and alk at sea levels, there tissue also likes iodine which helps it adjust to lighting