Elegance colonies problem need expert advise

[ManWithAPlan]

Hello, I'm Mike,
I have a 100 gallon LPS dominated reef tank.
In it I have 3 Elegance corals, all purchased together half an year ago.
One remained just as it was when I got it.
One still expands just as much vertically and horizontally but more narrow than it was when I got.
But one in the past few weeks has completely shrivelled... it expands to maybe 10% of what it used to open up to, looking very skinny.
No discharge of any kind.

Water parameters are all normal except alkalinity which is 12Dkh. Nitrates around 10.
All other coral are doing great.
For feeding I broadcast red sea Ab+ twice a week.

I tried doing a 50% water change but it had no effect on the coral that shrivelled.
Placing it in calmer flow and lower light didn't effect it either.

Any ideas on how to maybe help it recover?
what could be wrong with it?

 

[edsbeaker]

Following.
I’m having the same issue with an elegance, and all other LPS and softies are happy.

 

[Uncle99]

Common problem with this coral type I think.

Great in start, then down the road, rapid collapse.
I gave up, whatever they need long term, I simply don’t have.

Never bought one again.

Some claim 3+ years but I not seen one yet.

 

[ManWithAPlan]

Here are some pictures.

 

[ManWithAPlan]

The last one is the problematic coral

 

[Shirak]

Not sure I see a problem other than they look a little pale. What are your nutrients, light level, and do you feed them regularly?

 

[F i s h y]

https://www.reef2reef.com/threads/e...se-and-treatment-with-fresh-water-dip.654005/

 

[F i s h y]

Ive seen this work, but Ive also seen it not work.

 

[Shirak]

I don't see any signs of elegance coral syndrome. I reread your first post. I think they are starving. LPS and especially elegance need to eat. nitrates at 10 is on the low side. PO4?? broadcast feeding redsea ab+ twice a week isn't going to cut it. frozen mysis target feeding 2 or 3 times a week.

 

[ManWithAPlan]

Update, it's been 2 weeks.... and as of yesterday the other elegance corals stopped fully opening. Depressing.

I tested the water,
Salinity 1.025/ 32ppt
Kh 12-16
Po4 0.12
No3 20
Ca 450
Mg 1600

I added a phosphate absorber to the system.
Also I've been feeding frozen red plankton and coppepods twice a week