Good job!! It probably is adjust to the water and light at the same time. Mine did that at first, but I think by day 3 it was out. Again I had to move it around the tank a few times over a course of about 2 weeks before I found it's happy place. Mine is atleast nine inches across when it's fully opened. When I first got it, it fell in the sand and suffered some die off (you can see some of the dead skeleton in the pic), but thank goodness it made it. Be careful not to let it fall face down in the sand as this is what happened to mine. Do you know what lighting it was under originally, and for how long they had it. Yours looks really good and it will be a fabulous coral when it finds it's happy place, your lucky. I love wall hammers as mine is about 5 1/2 years old. Good luck I hope it does well for you.