3 full grown RES = 12*10*3=360 gallons! 120 gallons is good enough for 1 full grown female, not for 3. An outdoor pond would be best... or a large indoor pond... I guess if you have a basement you can set something up there.
About salmonella... a lot of things we come in contact with may be infected with salmonella.... raw eggs, chicken etc. You need to wash your hands after handling your turtle.
By the way, make sure you've read through the main site before getting your little ones: www.redearslider.com


