Turtle set ups are PRICEY. of course I'm sure youll do all the research so I'm not going to start with it, but turtles need huge filters.
I don't know the dimensions of your 29 gallon high, but you could probably fit in a musk/mud turtle. They max out at 4 inches. It may take you a while to find a breeder, I don't hear too much about them. These turtles are also called stinkpots, if you scare them they will release a horrible smelling liquid, so I don't know how possible handling is if you want something interactive.
http://www.exotic-pets.co.uk/common-musk-turtle.html
For other interesting pets you could look into crabs, some lizards, or even mudskippers (yes they are fish but they are fish that need land!)