Yep. That 'un.
It's been weird. Re the bad barrel of salt, I've ruled out metals, ammonia, refractometer error, phosphate, nitrate; fish are all healthy; crabs and snails healthy; calcium ok at 420, but a real high mg (1750) and a high alk, in the 9's. Only thing even marginally out of parameters. I've never had such a puzzle. The only thing I can think is that they either left out a trace or put way too much of something in that I don't have a test for. The response to the new salt coming in was within an hour.
Weird as I've ever met in the weird stuff with my tank department.