Tiny Regal Tang Breathing Heavy

[do_0b]

Hi guys,
I have a problem. I bought a regal tang from BA's a couple of days ago and i added to my tank. At first it just swam into the rocks and i thought its normal and will take time before it would come out. But its been in the back for 2 days now and i dont think its eating. I see it breathing heavy..but cant seem to see any white spots so i dont know whats wrong. Nitrate is about 5. ph is about 8.2 salinity is 1.025. Temp is around 78.