Cynarina not doing good, please help.

[MCatano]

Hi Everyone,

Out of nowhere my Cynarina are looking bad. I have not changed anything, moved them or added anything new to the tank. I will show a current pic and how they were last week. Any help would be great.

Parameters have been steady at :
Salinity= 1.024
PH= 8.3
CA= 430
MG= 1290
No3= 10
Po4= .04-.06
KH= 8.6-9
Temp.= 80 and normal for my tank

 

[emilio365]

What Coral is that above? The green one. Maybe sweeper tentacles are stinging the Cynarina during the night ?

 

[MCatano]

Space invader with deadly tentacles but not does not reach it for sure. Also you can see the skeleton on the Cynarina on the right and that is new too

 

[MCatano]

Anyone else with thoughts?