I have now had a Powder Blue Tang that I found dead this morning. Now my fire angel fish is now dying or pretty much dead. Its breathing just upside down so its on its way out. Now all my other fish in my tank are doing fine clowns and damsels. I got both of these fish from a (nameless) seller. I have had the fish for about 3 weeks now. All my parameters are good except maybe my alkalinity cant check it. Any ideas. I thought my powerder blue tang may have had ich but now that my angel fish is dying/dead now too im starting to think otherwise.