Help with new fish

[linelife1474]

White spot on coral beauty and wrasse looks like its dying

Ammonia 0
Nitrate 10
Nitrites 0
Ph 8.1
Cal 450

My yellow tang was shaking his tail at corals head for first day but has left him alone today and now the white spot

 

[carrots]

Did you QT the fish for parasite before putting in tank with other fish? Do research on this site to find the best way to treat.

 

[MMacro]

How long have you had the tank set up and how big is the tank?

 

[linelife1474]

7 months next week and 55 display and 20 gallon sump\refugium