What is this snowflake looking stuff?

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mic209

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It's blown up all over my tank in the last few weeks, literally looks like little snow flakes, it's on the rocks, frag plugs, over flow box, just about every where besides my sump and glass.
ImageUploadedByTapatalk1429895553.594033.jpg
 
I dose 2 part and acro power, that's it. Been dosing 2 part for over 3 years and this stuff just started popping up a couple months ago. I don't think it's detritus as it doesn't blow off, needs to be scraped. And if it's calcium carbonate, why does it only grow where the light hits?
 

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