What causes Zoas to die?

akaatomic

New member
Over the past few months I've lost three different zoa frags. They start out opening fine and then slowly stop. Eventually, they darken and crust over before finally disappearing completely. I have shrooms, LPS, Rics, etc... all doing fine. It's just zoas that I'm struggling with. My question is, what are the common causes of death? Here's my params:
4x65w PC over 90gal
Moderate flow
Temp=80-81
Sal=1.024
Calc=440
Alk=12
Amm/trites/trates=0
No dosing, just 20% WC every two weeks.
My reef tank is very clean (just one year old). Could it be too clean for zoas? Too young?
 
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