Turtles are not social creatures, and they do not get lonely. Hence, it is alright if you buy a single turtle for your aquarium. They prefer to live alone. If you put multiple turtles together then they might fight among each other, making it necessary to have adequate space for all of them. Usually, people are advised not to pick up their turtles too many times. They get stressed when they are handled by a human. Stress in any animal is not good and it affects their health and longevity.