What is your canary coral?

[Tyler Flynn]

What coral(s) lets you know something is wrong in your tank?
Mine is my splatter hammer. Not sure why, but it seems to be the first coral in my tank to stress over an adverse condition.
My heater failed on today and my tank hit 85 degrees. I guess i'll be investing in that heater back up i've been contemplating for a few years.

 

[vtecintegra]

Sinularia. Seems to hate any changes. Even just adding aminos it shrivels up. Gonis seem sensitive, too.

 

[shakacuz]

as of now, it’s my CB golden jawdropper. bleaches on me instantly if something is out of order