HELP...Damsel fish acting strange
 

I have a yellowtailed blue Damsel fish that is acting strange tonight. It seems to be gasping for air and swimming very eeratically (sideways, darting everywhere) which is odd for this fish. All my parmeters are good in the tank and all the other fish are doing good as well. Does anyone have any suggestions as to what could be happening? Also I have a QT tank should I look at trying to catch it and moving it over to the QT for a bit? Any help would be appreciated.
Thanks,
Steve

Water parameters are currently:
Nitrates-0
Ph-8
Nitrite-0
Ammonia-0
Calcium-420
Kh-8
Phosphate-0
Salinity-1.026
Temp-78

It's probably just dying. Fish who just die for the littlest reason will die like this. I would recommend QT'ing it if you can't be there for the whole process to watch it die. It's usually pretty quick if it is dying though if yours is dying. Eventually it'll just stop swimming and be pushed around by the current and may still be breathing, but I consider that the point of no return and absolute certainty.