The Reef Tank banner

1 - 3 of 3 Posts

·
Registered
Joined
·
8,247 Posts
Do you have a source of coralline algae in the tank?
I can't see the purple very well in the photo, but if you don't have a source of coralline in the tank I would suspect cyano.
 
1 - 3 of 3 Posts
Top