I have lost a couple of fish - any help

[jr8budcar]

I have lost a couple of my fish in the last day. The ones I have seem stressed. Breathing a little fast. My levels are:
Nitrate 20
nitrite: 0
alk: 180
ph: 8.4
salinity:1.023 - 1.024
ammonia: 0
I dont know what else to test. I have done a 10% water change checked everything twice. I lost 2 clowns , my beauty angel and my convict tang is hiding breathing heavy.
Any suggestions

 

[elfdoctors]

If this came on fairly suddenly and there are no new fish, and your levels are okay (as they appear to be), the most likely cause would be a poisoning of some kind. Has anything been put into the tank recently. I would suspect soaps, or other chemicals which might have been on your hands.
I would do a larger water change and also dose some carbon to absorb any organic toxins.

 

[jr8budcar]

It looks like I have been hit by ich, I didnt catch it even though I have had fish forever, I didnt catch it. I now have the meds so i can only hope for the best