1 mushroom polyp turning white ? why

[bigjimintp]

there is 7chocalate colored polups on this rock all others are open wide but this 1 is turning white , i dont know why

 

[kzoo]

Did you just get them? What lights do you have them under?Have you check your water?

 

[bigjimintp]

i have had them for about 3 months , i have 65 watt 10k pc , no i havent checked water yet

 

[crox]

Do you have any other corals in the tank that might sting him?

 

[bigjimintp]

no other coral near it , just an orange gregornia but it is far away just 3 damsels , algie blenny , 2 serpant stars and a choclate chip star , 6 redlegged crabs, 8 pyramid snails 2 feather dusters