ok so i got a 29 gallon biocube and after like a month of waiting and finally decided it was time to get a corl and fish so i got a blue damsel and a small colony i guess you would call it of zoanthids and 2 mushroom corals about 4 days ago idk what kind they were n the clearance rack LOL but anyways the zoas and one of the mushrooms are doing great and looking good but the other one doesnt open all the way and is turning a dull color is he dead or just in shock ? or is he stressed can corals get stressed ?