When you changed lights you upped the par a lot, it then killed the algae that grows inside of the zoa's
When you pulled your fish the water got a lot cleaner No food or poo to cloud things
There's a chance that if you move them to a lower light place in the tank they may morph back Those 120's have a par close to a MH
250 watt bulb. I melted a few of my corals with them.
Most people create their own problems by not following the basics and refusing to stock appropriate to their system. Gregcoyote 2013
SPS = Stability Promotes Success