Yes I was reading that just prior to posting on here actually.
At the very bottom on the page it states this"
Exercise inactive cathodes (occasionally cycle the tubes through all cathodes).
This will keep cleaning the coating off before it becomes too thick.
Example- Nixie Clocks: Rotate the numbers like in a slot machine (a.k.a. one-armed bandit or fruit machine).
That is why I wanted to implement a slot effect, plus it looks cool! lol