Is this green coraline?

[rmorris_14]

Is this just green coraline? It’s kind of taking over the back of the tank. Doesn’t wipe off. It’s not super pleasing to the eye. If it is, I’ve read the purple should outpace the green at some point?

 

[vetteguy53081]

It may be algae over coraline
Best way to determine is to scrape off a piece and see if it hard or soft
If the base is. Calcium like, brush the surface and see what’s under the green

 

[Fishy888]

I have seen green coralline on live rock. It's been a good 10 years or so though. The green coralline was light in color. Does the green algae feel slippery at all? There is a type of green algae that has more of a rubbery, slick feeling. I can't remember what it was called now but it grows much like coralline.