coralline algae

[magic]

some one told me that blue lights make your live rock grow coralline algae, and that all I have to do is turn them on for like an hour before and after the main lights come on. Is this true?

 

[bdhough]

kinda sorta. They have their facts wrong. The effect of the blue light before and after the main lights is to provide a "dawn and dusk" effect for all the life in the tank. It won't benefit the coralline either way. Haveing the lights on, small amount of waterflow, good calcium levels, and a salinity of .024-.026 is what you need.