What Is This?

[Aquagirl]

My live rock is turning white and now has multicolor spots on it. I attached a picture, so maybe someone can shed some light.

pH 8.0
Ammonia 0
Nitrite 0
Nitrate 10 ppm
Calcium 480
Salinity 1.0215 but it's swing arm hydrometer so it's not accurate but general ball park

 

[Pistol]

Coraline algae, starts with lots of color but ends up dominated by purple, it's a good thing

 

[Skim]

Looks like Tonga or Fiji rock, probably just Radioactive material coming out of the rock from all the Nuclear testing that was done in the Pacific. Lol
Just Coralline Algae but it does make me wonder sometimes. It would be neat to have a Geiger Counter to see what these rock and Corals are Glowing at.

 

[AdInfinitum]

Coraline algae, starts with lots of color but ends up dominated by purple, it's a good thing

It also shows a lot of colours when it is dying and I'm assuming when you say it is turning white means that it was purple before.

If so...the first question would be, is salinity 1.0215 a typo? If not that's likely your answer....

 

[heath]

the rock in my fowlr did and has the same thing.. I have never worried about it...

 

[Alberych]

The dark purple is obviously coraline, some of the other more pastel-y colors look more like bacterial colonies to me. Totally normal tho and nothing to worry about =D

 

[Pistol]

I was assuming this was a new tank, how old is it? and verification on salinity would help