I Have put rock live rock in my tank and it has a purple film growiung over it, what is this?

Question

I Have put rock live rock in my tank and it has a purple film growiung over it, what is this?

Answer 1

fungus.  

put janitor fish to l**k clean the live rock

Answer 2

That's coralline(type of algea)... It's a good thing.. It gives ur tank a cool purple color.

Answer 3

It is cyano bacteria. It can prove to be a big problem. Dont put fish in till it is gone. Do seaches for red slime algae and cyano bateria.