They look fine so I’d say stress unforunatly this happens. Sometimes the ph from lfs to your tank or temp or many other simple things could have done it. Will your lfs refund you?
I plan on doing one from now on. Would a QT have helped in this instance though since it was just shock?Yeah can’t do it better than that. Like I said it’s just stress that did them in. But a qt tank is something to think about.