Algae ID?

I found a new store in my area that had some great looking coral and at prices i've never seen locally. It's also the only store in my area that carries SPS. Aside from some aiptasia and this unknown algae, everything looked really healthy growing under 12 Radions, lol. This stuff was all through the tank, attached to eggcrate and attached to the rock the coral were on. It reminds me of Staghorn algae in freshwater, in the way it branches and looks wirey. It was a dark reddish/purple in person. I'd love to buy from this store but I don't want to put anything bad into my tank either. Any ideas?

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Looks like a species of hookweed, Hypnea. Very invasive. I'd avoid buying anything from a tank with that in it.
 
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