[Blueface]

Originally Posted by Wolfgang

coraline algae can come in many colors from green to white to purple. the majority of mine if green. Look at the overflow chamber those green circles are actually green coraline that is growing. I wish it was purple!

I have seen it in various colors while red is prominent, with white being a far second and so on.

Simple rule I always followed. If you can wipe it off or brush it off or if you can get it to partially dissipate in the water via a brush, coraline it is certainly not. If it doesn't even budge, coraline it is.