Green rocks - good or bad?

[pbenjbear2]

Would really like to get some input from members: Our tank is about 5 months old, we are getting great Coraline growth in the tank but recently we've had a huge increase of green colouration on our rocks. Wondering if this is good or bad? It is not hair algae, not slimy, just color to the rocks.
Parameters are good, lights are set for 8hr period. We have an excellent clean up crew and a pretty big population of pineapple sponges throughout.

 

[Euphyllia97]

In my experience this is a good sign! It will go away very quickly and will turn in to nice purple coralline!

 

[Idoc]

I think it is a good sign in a young tank! You are developing increased biodiversity. Just increase your CUC to make sure you have the right blend to eat the new algae forming on the rocks. It's all part of the cycle for a healthy tank!