Thanks for the information. I have had these zoa's for a few months now and had no problem when they where in the 29g BioCube before moving them into the 46g bow. None of my other corals are having any issues is what gets me, I do have bristtle worms and have been thinking about getting a coral banded shrimp to take care of those guys (not sure if it will work or not). Besides that the only change really has been the addition of the yellow tang, and these zoas are in an area he doesnt really go to and the changing out of the light bulbs on my T5's about a week ago.

Lights:
Nova Extreme T5's (4 bulb) running all ATI bulbs.
Flow:
CPR BakPak powered by a Rio 800, Maxi Jet 900 & 400