Unhappy Corals

[RMC]

Update. The Chemipure has been out of my DT for 3 months. My corals are alive but not opening up, aside from the flower pot coral that didn't make it. All of the corals are not opening up.
The fire and ice zoas have multiplied but have never opened completely.
I've moved them around in different light and flow conditions, left them alone for a couple of weeks then moved them again.
My levels are all in line
PH 8.0-8.3
Ca 470
KH 174
Mag 1350
Nitrate between 0.0-0.2
PO4 between 0.00-0.02

My live stock list:
1 black and white Orc clown
1 true Perc clown
1 fire shrimp
2 cleaner shrimp
6 blue legged hermits
3 snails

The shrimp don't go near the corals unless I'm target feeding the corals.
Any suggestions?