Disabling lightbox in Activity+

I'm getting ready to deploy a new theme on my live site, it has its own lightbox support and it is conflicting with activity+.

It's not really a conflict because they are both working great, but when I click an image in the activity stream, I get both modals layered on the screen. I want to use the theme's lightbox system to keep it consistent throughout the site.

How do I safely disable/remove the activity+ lightbox without breaking everything?