Coralline or Red Algae

[bsalvador]

Hi, can anyone tell me if this is coralline or red algae? Thank you!

 

[Oldreeferman]

Pic is a bit too distant to be certain but in my exp. on a few different tanks blue/purple coralline starts 1st and is usually most dominate with reds and other various hues popping up later on after tank matures in various spots such as shady areas. But again a better close up would tell, coralline is also a encrusting algae and not fuzzy ever so closer examination should tell you what it is with this info, if in doubt still then a simple light brushing with a toothbrush on it will also tell you since red algae will come right off easily, coralline is hard like lime and difficult to get off anything without scraping.

 

[Newtybar]

Hi, can anyone tell me if this is coralline or red algae? Thank you!

I think this is red algae...

Coralline should be crusty like calcium

 

[Imaexpat2]

One good way to tell if its coralline algae is to look at the edges of it and see if there is a faint white line of new growth showing on the edges of the growth.