My live rocks!

[FindingPonyo]

First I’d like to say thank you for anyone who will respond to this thread.
Anyway, when I started off my tank I had several pieces of live rock and dry rock and the live rock had purple on it which I knew was good. Since then the purple on my live rock has faded into a white. Are my rocks bleaching? My corals are doing just fine and my parameters are good. Although my KH is a little low but nothing to be concerned about. If you have any tips about that let me know also. Why are my rocks bleaching but the rest of my tank is fine?

 

[Retro Reefer]

Your tank looks new, probably not able to support coralline at this point.. more details about system and complete parameters would be helpful in giving advice.