Photo View Display Order

Using the photo theatre, I'd like to change the display order from the current photo ID descending, to photo ID acending, so that older photos are shown first.

 

I've tried changing $order in Model/Photo.php , this changes how the thumbnails are ordered, it also nicely changes the order on the feed, but the prev/next links on the photo viewer are still following the ID dec order??

 

Any ideas where I change this?

 

Thanks