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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.

Comments

GinoV84
I have quit a bit of this red type - it doesn’t budge whatsoever - even if I try brushing it. Thanks for posting this!
serpico1
I have quite a bit of this growing on my rocks as well. I have some purple coralline algae growing on the glass and rocks as well. But this deep red, almost rust colored stuff us not hard like the other coralline. It feels a little slimy. But it will not come of the rocks, I have used my finger nail to scrape it and it doesn't budge. There is none on my sand or glass only on the live rock

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