What is this on my rocks???

Franken tank 2019

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So I have been sending pictures to all of my LFS and none of them can tell me with any certainty what this could be all over my rocks. I have had this tank set up for about 2 years. All of my levels are fine.
Alk 8.4
Cal 425
Mag 1490
Nitrate 2
If anyone has any ideas or help on what it could be it would be greatly appreciated. I dont have a whole lot of clean up crew because this was my higher end coral tank and they were always knocking stuff over and almost killed an entire three head gold torch. But if clean up crew will take care of the issue I will do what is necessary. Thank you for your time all!!!

20200112_134732.jpg
 

Idoc

Getting lazier and lazier with upkeep!
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It's really hard to tell by the pictures. Do you have access to a microscope to look at it?
 

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