elegance coral
They call me EC
The only time I have seen them swell up at night is after they have been severely damaged by intense lighting. I said you would know something in the next few days, unfortunately, it doesn't look good. I believe, its tissues have been ravaged by the over exposure to your lights. It will most likely deflate and come down with an infection. I have used iodine dips and dosed the tank with iodine to help fight off these infections. There may not be enough viable tissue left on this coral to save. I hate to give you bad news, but your coral is in very bad shape. Infection is the big enemy at this point and you may not be able to fight it off. Let us know how it goes. I'm sorry, and good luck.