My ricordia looks like poo, anyone?

[Hinds04]

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looked like this when I got it 6 months ago, now it is about half the size and looks unhealthy. All other corals are thriving. Any ideas?

 

[austinsdad]

Nitrate readings?

 

[Hinds04]

0, all other corals thriving. It has been small for 4+ months. It still opens during day and shrivels at night. It is just much smaller and not as full. Has not reproduced at all or even moved.