Elegance coral hasn’t fully opened in a week or two

[gatorcream]

Hello! I’ve had this elegance coral for about 3 months now, and just recently hasn’t opened up fully in a while. I’ve been testing everything, and it’s all been good and normal, no fluctuations or odd things showing up. Every other coral is doing fine too among zoas, a toadstool, cloves, BTAs, gsp, xenias. Note that the picture looks much more blue than the lighting is in real life, my phone saturates the blue a ton. But anyways, the elegance is still very colorful and doesn’t look weird besides the fact that it’s just been kind of shriveled up. It’s gently resting on a hunk of live rock alone, is well lit (at the same level as a toadstool and anemones that are thriving).
I do a canister filter without sponge pads + a protein skimmer. Water changes about 20-40% bi weekly, but have enough clean up crew (snails+dwarf hermits) to keep algae and waste under control, look pretty clean in there.
Any ideas or help? Thank you.

 

[Dkmoo]

Look up ECS or Elegance Coral Syndrome.

AFAIK there is no know cause or sure-fire treatment and most end up in a slow decline to death.

I think anecdotally, people believe it has to do with the artificial environment something critical that can't be replicated in home tanks (ie, water depth/pressure) or its dependent on specific genotypes/species/or even down to individual colonies.

 

[Uncle99]

Yup, never any luck with elegance.