[ID] hard Algae, only grows on glass.

[Salty716]

Not on any of my other tanks except this one. I have this red - almost pink algae that grows on my glass exclusively. Doesn’t blow away so it’s not cyano- doesn’t grow like coralline. I have to use a blade to get it off as flipper scrapper doesn’t press down hard enough to remove. Thanks in advance.

 

[mann1139]

Coraline can be that dark, but it looks more like cyano to me.

If it wipes with a sponge, its cyano. If not, its coraline.

 

[Salty716]

Coraline can be that dark, but it looks more like cyano to me.

If it wipes with a sponge, its cyano. If not, its coraline.

Doesn’t blow away so it’s not cyano- doesn’t grow like coralline. I have to use a blade to get it off as flipper scrapper doesn’t press down hard enough to remove.

It’s harder to remove than my pink coralline

 

[Salty716]

It’s harder to remove than my pink coralline

Video of scraping it with a flipper