Chalice flaking off?

[Tyguy35]

My chalice which has been in my tank for some time has recently started to fall off. Nothing has changed in the tank what so ever.

 

[DSC reef]

Is it possible something fell on it like another coral or salt creep? I've alk swings cause random necrosis like that on chalices before.

 

[Tyguy35]

Actually sorry o forgot I housed a frog fish for about a week and that when it started to go south. The frog fish is now gone and I am about to do a water change. I am using salt with a high alk content. Nothing can fall on it. Well see how it looks after a water change.

 

[nautical_nathaniel]

Frogfish might have upset it but I've also had something as simple as a big grain of sand sitting on top of the chalice make it do that. If it stops flaking, it should grow back over it in no time