south australian murry short neck tortoise. better to have 1 or 2?

by jim

hi

well the Australian tortoise if different to rest of the worlds as it lives under water for 4 years then goes on land......but anyway i got one that is about 2-3months old my problem is i dont know if it gets lonely or not. it looks lonely sometimes as it goes up to the reflection on the tank walls. but i hear if u get two tortoise's one will kill the other is this true?
i heard if you have 2 females they wont attack each other is that true???
will 2 males kill each other??
will 1 male and 1 female kill each other???
dose a tortoise need company?
n how can i tell what sex it is?