What type of algae is this?

[childress5tyler]

Sorry if i'm not posting this in the right forum but I was wondering what type of algae is growing on my frag tray? is it harmful and have a specific cause? any input would be great..thanks

 

[bang guy]

Looks a lot like Coralline Algae.

 

[childress5tyler]

awesome...good stuff, was hoping it was that but wasn't sure...coralline algae comes in all colors right? red, purple, green

 

[bang guy]

in addition to yellow, hot pink, white, black, even blue.

 

[childress5tyler]

I have always been confused on coralline algae...what does it do to your tank other than add color? and is it ever harmful? (I realize the second question may be a stupid on but i figured i'd ask)

 

[bang guy]

Other than add to a more natural look to a tank it takes up the real estate and makes it difficult for nuisance algae to take hold.