a 30 gallon (100 l) tank minimum. the larger the tank, the better it is for the creature.
make certain there is sufficient water so the animal can turn if it ends up backwards. this should be three-quarters of the turtle’s length.
the smallest acceptable aquarium sizes for turtles is 4 times the length of the animal. the width should be at least twice that of the animal. the height ought to be 2 times the turtle’s height. add to this figure 8 and half times the highest level the animal can get in the aquarium. the size has to be that of the adult turtle.
otherwise, the aquarium will become too small 