Expired Prime?

mossman

I looked inside a relatively new bottle of Prime and noticed a dark ring around the bottom. I then shook the bottle and it diluted. I took a whiff, and the prime smells like sewage water. I realize Prime isn't exactly pleasant smelling, but I don't recall it ever smelling like this. Does it sound like it is expired? I've had a couple unexplained fish deaths recently after water changes, and can't help but wonder.
 

Stoka

The dark ring/spots and smell are normal for Prime.
 

nikm128

I would highly doubt it's expired. How old is it?
 

wodesorel

Prime surprisingly doesn't go bad, according to the manufacturer.
 

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