Closed White Zoa on Flourishing Colony

[illprobablykilleverything]

Has anyone ever see this before?

This is happening in my 80g total volume frag tank.

My colony of zoas have been crushing on this tile, but yesterday I noticed one had turned white.

Since this spin test on the 30th I’ve:

- slightly reintroduced my T5’s, but that was 10 days ago
- same with a slight increase to my LEDs since I realized I was under lighting corals and mushrooms
- spot fed reef roids
- introduced 4 new zoa frags

I attached images of the soon test, the current situation and the 2 weeks ago photo.

 

[shakacuz]

did you slowly introduce the t5, or did you blast them on reintroducing? it could maybe be shocked from increase in PAR. but if nothing else is showing sign of change/discomfort perhaps check for pests? as you added new corals.