+1 he said it was a few years old. I feel like he meant he also hadn't even touched in in a few years.to cloudy and stink within mins
sight unseen i bet that rules out literally all other causes other than the sandbed.
I could easily see a 3 year old sand bed never cleaned nuking a tank.
It happens in tanks that AREN'T transferred when someone finally cleans it and tries to do it ALL at once, and nukes a tank.