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What is this fuzzy stuff on rocks? (1 Viewer)

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Arame

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So my tank is about 3 months old and I’ve started to see this white fuzzy/hairy stuff growing on the top side of my liverock. I’ve tried scrubbing it with a toothbrush and it doesn’t really come off. It’s not really green so I don’t know if it’s algae, could it be bacteria?

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frankc

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It doesn't really look like dinos to me - they are a golden brown and they come off pretty readily. I don't know what it is. One guess would be tiny hydroids, but I can't tell.
 
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