nub Q: Adsense with other ad networks

Hi all,

Pardon my ignorance. I am new at this. I use adsense on my forum pages. My eCPM for about 120K impressions per day is $.67. I use adsense on two spots on my pages.
Should I consider another adnetwork like Yieldbuild? Would it be ok to leave a spot run directly by adsense and use YB for the other spot?

Thanks

The best solution is to set up a tier. Start highest campaign. When it can't fill, show a backfill campaign.

Some CPM networks do this already with their 'backup tags'. Adsense does not have this function.