DJ in WV

When i first got this frag it stayed open and was healthy looking then it started shrinking up. I thought it was just shedding and it seem to be but its been closed up for a month now opening part way for a few days every ten days or so. All my sps, lps, shrooms and gsp are growing and have full polyp extension. I have tryed moveing it around in the tank with no great results, It is bigger then when i got it with more branches but stays drawed up. There is no slim rot or any signs of dieing except of staying closed up. I keep the tank at 78 and a 12 hour light cycle with 3 250 watt Phoenix 14k lamps 10in above the water all parameters are good 8.1 around 180 kh no detectable no2 or 3 and no algae to speak of in the tank so I would assume the test is right. Any suggestions would be great