Single White Spot (Coral Beauty Angle)

http://runyon18.deviantart.com/gallery/#/d30c4x3

Anyone know what this is? It looks Like a pimple under the scale. it was just noticeable two days ago now it is very noticeable and is getting bigger. what can i do if anything?
20H
3 penguin 100
1 velvet damsel
1 purple suedochromis
1 coral beauty angle
40 Lbs live rock
2 hermit crabs
1 sand sifter star
1 yellow watchmen golby
1 Curlyqui
3 zoathid pods
GH 180
KH 180
PH 8.5
NO2 0
NO3 15 ppm Mg/L
Weekly 30% water changes
1 year running 3 months with Coral Beauty

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Single White Spot (Coral Beauty Angle)

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