Welcome aboard!
Well.. it doesn't look very good. It has lost a lot of tissue and receded. The exposed skeleton is now green with algae. Looks like there are some bare spots towards the center too which is not a good sign and to me indicates it is going further downhill. It looks kind of bleached which could indicate lack of food, but there is algae growing so probably not the cause. My guess would be light is too high perhaps. How long have you had it?? If you could post more information on your tank water parameters, how often you feed and with what, and light levels that might help diagnose better.