Not the store directly, but if they mix wild and captive or use copper in the system or lowered salinity, they fish can go into a stress mode and some fish cannot recover for the stress. Without a full necropsy, it will be hard to tell. Only obvious signs can really help assign a cause. Sorry. That is how this hobby works sometimes. I am sorry for your loss. I just lost fish I have had for over 6-10yrs to some mysterious issue and I was heartbroken. Really sucks losing an animal.



