Failed quarantine...

[RJKain-777]

I would consider macro algae livestock. Really anything that's biological.

Yep, was the only thing I didn’t quarantine

 

[resortez]

Bruh, sucks losing that many fish to the point of wanting to use the tank for target practice. Can’t stress enough the importance of QT. I’m way to familiar with that heartache but the tank can bounce back. QT everything & when you least expect it, the tank will be looking good by summer time.

 

[Sharkbait19]

So sorry for your losses. It's not necessarily only "livestock" you should worry about. Unless you know they're in a fishless and safe system, anything that has been in the lfs water is at risk of bringing in parasites. Are you sure it isn't velvet you're dealing with, given the rapid rate of death?