Algae forming or just coraline?

[Blakskall]

I have rocks in my tank that are forming beautiful coraline algae, and others tht are a shade of green and brown, is this "bad" algae forming?

 

[Dyl1234]

How fast is the algae growing. Coraline algae grows slow.

 

[Blakskall]

I wouldnt say very fast, maybe try turning the lights off for a couple of days?

 

[Dyl1234]

I wouldnt say very fast, maybe try turning the lights off for a couple of days?

How long do you normally leave your lights on? And is the aquarium near a window?

 

[Blakskall]

Not near a window, lights are on from 8am-8pm, blue lights start at 8am, white lights kick on at 11am-5pm, blue lights kick off at 8pm

 

[Dyl1234]

Not near a window, lights are on from 8am-8pm, blue lights start at 8am, white lights kick on at 11am-5pm, blue lights kick off at 8pm

Most people recommend only 8 hours of lighting... That could be causing the algae to grow I guess....