Why not to use io salt

[Bblinks]

It's very seldom u hear some thing that drastic happens from using a bad batch of salt. Usually it's the more sensitive species that go first then if that triggers s mass die off it would still take more than just overnight. I have once changed my water with 40 gallons of fresh wartet not realizing until after that it was fresh, the salinity dropped a few points but luckily my tank volume compensated for it and everything pulled through. I am not saying that's what happened to you but who knows. I have always used io and knock on wood, I have never had any issues.

Sorry about your loses bud, No matter what it's still hard. I'll have some frags for you in a little bit.