>>Has anyone else had to modify the old BTE (box turtle enclosure) this summer?
>>

Has the divider helped? I did some minor rebuilding of the pen I show on my YouTube video. I removed the old dividers on the male said-they were vinyl lattice strips- with treated posts stuck in the ground vertically-like yours. I replaced short sections of the lattice so the turtles could still see each other, but the bottom third has plastic edging on it so the turtles cannot bite each other.

It took DH a day to do, but it looks great now. I need to up date the video Tess