Toadstool leathers turning brown

[HARLEY35]

I have had them for 6 months all water parameters are good, using t 5s. They are not yellow anymore they are brown in color what is the main cause for this happening are they dieing?

 

[1DeR9_3Hy]

Are the polyps extended? How long has this been going on? Any new (soft) coral additions recently?

 

[kingfisher62]

Is it a yellow fiji leather? How many watts on your T5's, what are your tank dimensions and where was the toad stool placed?