Why is my T5 light going pink?

(I know this is the T8 fixture forum but I couldn’t find a T5 light forum)

So, I have gone through 3 T5 fluorescent light tubes in the last week.

When I install them, they are lovely and bright for about 48 hours.

Then I turn them on, it’s a very dim, drab pink and the ends are black.

It is my understanding that this is the mercury escaping and that replacing the bulb should resolve the issue but it just keeps recurring.

Do I have the wrong bulb? Is it a wiring issue?

Any and all info would be greatly appreciated!