That's Coraline Algae...you WANT that stuff. It comes in all colors, but purple is the most common. It does come in dark red and even GREEN.
If you REALLY wanna get rid of it...... buy an urchin. They LOVE the stuff.
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38 Gallon Custom Starphire, Remora Pro, 2 Seio 820's, 24" Giesemann Infiniti 1x250W MH + 4x24W T5, 60lbs Live Rock.
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