Black specks with SPS RTN

Medic_bones

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So I have had several frags melt away recently. All have been completely fine one day, then start to RTN from the bottom up. As they RTN, these little black rice shaped things are revealed on the skeleton. They don't move at all, and no dips seem to effect them. Has anyone seen these before?
There is a pic of the whole frag and then two pics of the same frag under a microscope.
Salinity : 1.026
Ph: 8.25
NO3: 10
PO4: Negligible (hanna)
Mag: 1300
Ca: 390
Alk: 11.5 dkh

2020-03-20_01-47-20-95_326938184743562.jpg 2020-03-20_01-44-55-27_326921190118047.jpg 20200320_014005.jpg
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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