Hmmm...
I would of course take all the tanks. I love octagon tanks. I returned one a few years ago that was leaking, but now i'm kicking myself. There are some great examples online of dart frog tanks in the hex/octagon shapes. They really work well for making a tree stump tank for dart frogs. I think D. leucomelas would be great in a tank like that because it has some horizontal but a bunch of vertical space.

So yeah, I say take all of them.

Or give them to me.

Cheers,
Alex