New semicircle angelfish problems

I bought a semicircle angel yesterday about 11am. I brought it home...turned the lights off...covered and covered the tank. This morning I woke up and when I turned the light on he had white stuff all over him. He shakes a lot.
My water parameters are good. NO2 = 0, NO3=0, NH4=0, PH=8.2, salinity=1.023, and temp= 79.
Is this behavior normal for adding new fish?
 
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