I came home tonight to find my kole tang laying down on the sand with labored breathing. After checking her response to stimulus, I moved her to the "hospital tank" Then I notice my blonde naso curled up under live rock in an unusual fashion also with labored breathing...after checking her responses, I realized she was disoriented and lethargic...I moved her to the hospital tank suspecting something contagious...Now my kole tang is dead and the naso is in the corner floor level with her nose in the corner...I dont want to stress her any further so I am leaving her alone. All my other fish seem fine.

What could this be?

Should I dose my naso with antibiotics? My main tank?

Any suggestions are appreciated!

Salinity: 1.022
Temp: 78
Nitrates: 40 PPM
Nitrites: 0
Ammonia: <.025

Donny