live rock red bad or good

[puffer21]

ok i have no clue what is on my live rock there is red on them i dont know if it is good or bad please help me:rollface:thank you for any help

 

[Kaos]

Is it encrusting the rock or is it like a slime on the rock. It could be coraline (which is good) if it is encrusting the rock or it could be Cyanobacteria (which you don't want).

 

[dymaxiun]

Can you get pictures so it can be identified correctly?

 

[puffer21]

it was coraline