Help! Zoas Dying

Past 4 days my zoas are disappearing.
Random areas but all 6 of my zoa rocks are dying.
All my lps/sps doing fine.
Stable parameters (tropic marin pro)
Nothing has changed recently.
Any ideas?
Two days ago
http://ift.tt/1TsJp3a

Today
http://ift.tt/1XFWj0J