I agree about the tank deal. Most people in the know on Pig-nosed turtles have stated that they'd never dream of keeping one in less than 200g. They can be very easy to keep, but they can also be your worse nightmare. Turtles are notorious for hiding symptoms of illness, and FRTs are hard to bring back from illness. Many just get sick and die. For this reason, you need to be ready to accept that this thing could end up being sick, die on you, and you'd be out the money. There's no sure thing when it comes to turtles, especially pig-nosed turtles.
Josh H