What are these?

d2mini

Reef enthusiast
They're all over the glass of my nano.
They are tiny. This is as close as I can get to them with my macro.

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Too hard to tell if they are moving. That one grouping hasn't moved since i took the pic from what i can tell.
 
Q tip sponges grow everywhere, especially in low flow areas. If you ever look in a sump you'll see tons on the baffles.
 
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