It is not ideal for a newt to reside with a turtle. Even small turtles can nip off a newt’s leg or tail. Turtles also secrete and tolerate much higher amounts of ammonia than newts. Turtle’s need warm water and a heat lamp in order to survive, whereas newts can poison a turtle since turtle’s are omnivorous creatures that may view Mr. newt as a tasty meal. Newts require a temperature of 70 degrees Fahrenheit whereas turtles require at least 80 degrees Fahrenheit. Another difference in properly caring for both creatures is that each requires different levels of land, water and space within their tanks. Newts and turtles cannot and should not live together.