coraline algae turning white

[Cliffz]

Biocube-14--Steve T media rack--purigen, chem pure elite--upgraded pump -stock lighting--
folks,
MY live rock has purple coraline that i see is now turning white--what could be the cause? thanks all

 

[aeharkins9092]

i have the same tank and from my knowledge it will die off some times and then grow back. it happend to mine when i first got some new life rock and let it sit in its own tank for a few weeks.