Mushroom turning white?

[Idaknow15]

Any idea what is happening to this mushroom? It’s going white so I would assume bleaching but it’s lower down than others in the tank, and not near anything that could be stinging it ? So confused? Should I just leave it be and see what happens or should I try and remove incase it spreads to my other mushrooms?

 

[MERKEY]

Any swings in parameters?

Shrooms are sensitive to salt and temp swings as well as the other parameters.