What is this green stuff

[Treenk]

So I saw this a couple weeks ago and it has more than doubled in size. It's this green stuff growing flat on the glass. I didnt pay it any mind but I found a second spot today. Any idea what it is? Yes I know the red is a lot of cyano but so long as it stays in the sump I'm leaving it be.

 

[45ZoaGarden]

It’s just algae. Looks like coralline starting to grow

 

[vetteguy53081]

Birth of coraline. Scrapes away easily with edge of old credit card

 

[Treenk]

Wait green coraline or does it change color?

 

[MTBake]

Coralline comes in many colors. That sure looks like green coralline to me

 

[Treenk]

Cool thanks guys

 

[Treenk]

I bought both purple and pink helix corraline in a bottle and end up with green >_<

 

[m00ndawgtcl]

I used this product a year ago and had the same results. I performed aggressive water changes 2x in one week with GFO in media reactor. I think the product did nothing for my system. I bought a turbo snail a few months later and the coralline magically showed up. To be honest I'm not sure if the snail did the work or the Purple Helix... Let us know how it works out 4 you. Good luck.