They're a very challenging coral to be successful with and not one that anyone should place in a new system. Yours looks like it has been receding and doing poorly for quite some time. Optimal and stable conditions in a well established system plus regular feeding might turn it around in theory.
I've tried a few over the years, some lived for a couple of years but all eventually died. In most cases the fleshy polyp slow receded in relation to the skeleton over many months until there was nothing left.
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