Standard 40 hexagon i suppose. 24"tall, 18"x18". The leak is along one of the vertical seams, about 5 or 6" above the bottom. If i went half land half water i could just keep the water away from that seam and have land on that side. Which one would be better suited for a tall and narrow tank? The red eyed tree frogs, or some species of dart frogs? What are some of species of vine like plants you referred to? What about filtration for the water, small internal filter? I'm really don't know any terrestrial plants or maybe even immersed plants too well, crypts are very interesting immersed but i'm just starting out so anything is possible.