why so many colors on my rock?

[bianca90]

is his some type of alge? is it bad??

thanks

 

[alLexX]

its coraline algae me thinks,not good or bad,just nicely coloured

 

[mdaniel2882]

If the green is hard i.e. It won't just rub off it is coraline

 

[hackteck]

try to rub the red part that kind of looks like red cyano to me but i could be wrong if it comes off easy its cyano