Hello. I established a new 6 gallon Nano cube about 3-4 weeks ago. I finially got live rock, and it has been in aquarium for about 2 weeks now, and it some of the rock is turning purple, while other parts are turning white? Is there something wrong? The parameters are perfect, barely any nitrite, no nitrate, and no amonia. The temp. is at 81 degrees, and I am lighting the aquarium for now for 6 hours a day. The salinity of water is 1.025. Once a week I use Kent Marine Nano Reef Parts A and B. So What's wrong?