What is this?

[Daneguy]

Hello, we started a coral tank back in sept. We have seen an explosion of purple coralvite all over the rocks and glass. I have also noticed this dark and neon green stuff growing, is this another form of the coralvite?

 

[Flippers4pups]

Hello, we started a coral tank back in sept. We have seen an explosion of purple coralvite all over the rocks and glass. I have also noticed this dark and neon green stuff growing, is this another form of the coralvite?

Coraline algae is a good sign. The green stuff, not sure.

#Reefsquad

 

[Bob Loblaw]

...

 

[Tiger Brown]

Green/black is cyano.

+1 on this

There are tons of posts about it if you do a search, some good info here too http://reefinabox.com/cyanobacteria-spirulina-algae/

 

[Reefahholic]

That doesn’t look healthy. How long has it been there?

 

[120reefkeeper]

Agree .. the green is cyano. Try increasing flow in that area.