No, but they can carry samonella so you must clean your hands after handling them.
no
well, a "slider turtle", or a red eared slider always has a red line where their ears would be. that's obviously how they get the name!
Absolutly nothing. Only the color change.
The turtle family
you watch it
No. Eventually the turtle will kill the catfish.
The Red Eared Slider is the most common kind of pet turtle, so I'm guessing that the Red Eared Slider is the best kind of turtle for a pet. People do seem to like it!
At petco and at flee markets
10 to 12 inches....
yes
Yes, they have internal ear structures. They are sensitive to vibration and sound.
Every 6 months you should take the Red Eared Slider Turtle to the vet