Zoas dying

[KennyKen]

This has occured over the last two days and i have lost two of my favorite, albeit smaller, colonies of zoas.
They are closing up, and basicaly falling right off the rock.

levels are as follow
nitratres 0.1
amonia 0
calcium 380
Alk was bit low, 7,
ph 8
salinity 1.025
temp has been steady at 77, even with the heat in the day.

I cam down this afternoon and see two more, just so happen to be the 2 nicest ones left closing up.

Any idears so i can avoid shedding tears.
(rhyme was intended)