What is happening to my mushroom ?

[MenciTooLoko]

New to the hobby and this mushroom plus a zoa are my first and only corals in my tank. The first 2 pictures are what my mushroom looked like and the last 2 are what they’ve looked like for 3 days now. Does anyone know what this is ?

 

[MenciTooLoko]

It might be a little hard to tell from the picture but it looks like a puffy translucent film.

 

[shakacuz]

although the tank seems cycled, it seems too new for corals. how new is your tank? water parameters? lighting? how far from water line? flow?