Elegance coral suddenly closed up

CampAquarium

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We added an elegance coral to our reef about a month ago. It was thriving for the first 3 weeks- opened up huge and gorgeous, seemed to love its spot. Then all of a sudden, it closed up. At first it looked like it was pooping, released some brown strings. But it's been about a week, and it has only opened very slightly. It now appears to be secreting some sort of mucus/film. It has not receded from the skeleton, just barely or not opened at all.

Nothing has changed in our system. Everything else is doing well (euphyllia garden, zoas, toadstool, leathers, trachy, lobos, pectinia, setosa, and some acros). We did a water change a few days ago, and the elegance opened slightly more after, but still just barely. Any ideas what might be going on?

Parameters:
Temp: 78.0
Salinity: 1.025
Calcium: 423
Magnesium: 1485
Alk: 8.7
Ph: 8.1
Nitrates: 3.0
Phosphates: 0.07
 
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