Nuisance algae ID

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unklez

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I got this hairy cobweb looking stuff on my rocks, coral skeletons of LPS and sand. What is it?

IMG_20200622_213822.jpg IMG_20200622_213831.jpg IMG_20200622_213912.jpg
 
I'm guessing its bacterial based on the some of the longer strings and how it returns after 1 day when i clean it on a spot.
 
Prolly something to do with me dosing nopox and running a ULNS on a 2 month old tank.

I took a toothbrush to the rocks came off pretty easy and siphoned the sandbed. Maybe it will go away in a few weeks.
 
I saw a trochus snail going over a patch of this stuff on a rock and then it died right on the patch. You guys think its still bacterial?
 

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