Can a large turtle and a small turtle of the same species live in the same tank?

Answer

Depends on the kind of turtle. Most can but snappers cannot.

ANSWER

YA BUT NOT ANY SNAPPING TURTLES THEY WILL DIMEMBER ANY TURTLE EVEN ANOTHER SNAPPING TURTLE

Answer yes they can! even snappers can! i have a male red eared slider and a common snapper that have been in the same tank for over a year and they seem to get along just fine!

The only thing is you have to pick them up and handle them commonly and watch them both closely

do not take the fact that they can for granted pay very close attention to your turtles and keep all snappers away from children and especially watch them closely during feeding time

snappers attitudes are directly related to how well they are fed and treated

the more time you spend with them the calmer they become