Spider Plant Disease?

[greenthumbomaha]

I'm not big on houseplant care, but I did bring home a few off the TLC rack yesterday. I had concerns about the health of this spider plant, but gave in. It doesn't seem as it was ever overly wet, but I don't know enough to rule fungal disease in or out.
Research shows this plant is overly sensitive to Fluoride. I don't know if Lowes uses filtered water.
Does this look like a fungal problem?
It is isolated in my bathroom No insects are visible with a scope. Only a few leaves have this brown stripe down the center of the leaf.
Thanks for any help!

- Lisa