Red Coralline algae

By: melev | Tags: | Comments: 2

Sometimes you will find a very dark red growth encrusting on the rock. This would be red Coralline algae, and it is nothing to worry about.  Rather than being cyano bacteria, it acts like it is painted on the rock and won't budge when hit with a powerhead or turkey baster.  The more common type is pink coralline, but some red mixed in can look quite nice.