What to do with unprofitable or zero-profit ads?

[ARandomPerson]

Hi guys,

I was reviewing my statistics and I see that there are some types of ads that don't generate much... or sometimes nothing at all (like one I have on the homepage).

I'm not sure what to do with these ads:

- Do I delete them and leave that space empty?
- Do I replace them with ads that do generate revenue even if they are duplicate ads?
- Do I replace them with auto-adjusting ads?

Let me know... I'm not sure what to do...

Thank you...