Large 4 in mushroom

I have an 4 in mushroom in my tank it is starting to turn blueisg grennisg i hope it is not dying.. or what can i do to bring it back if it is
 
If it is turning blue and green then it is probably coloring up which is a good thing. I started out with some brown mushrooms that came with a feather duster I got and now they have a blue green hue to them and have split several times.
 
Yea thanks i might of been that It had to much light.. I turned the light off and it turned back to its normal color
 
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