All fish dieing

[Craigdillman]

lots of stores run copper in tanks to put ich at bay could be that some fish are sensitive to it

Sounds like its a acculmation issue tho , or heat related issue. If they accumulated them super fast then it could take up too 1 day and a bit to die from salinity stress

Could be ich or velvet in the water as well and they went into an envirmeont that was contaminated ?

or could be simple as stress of the fast move killed them

I kinda think you have a right to ask what happened ? I know its not there fault but if there a fish store they should be able to keep fish alive weather its from a shipment from hawaii or from your tank shouldn't make no difference>?

my 2 cents

at least try to get a discount off some new ones ?