I have air stones in all my aquatic tanks. The newts don't require them but it will help keep the water "sweet". The bubbles move the surface of the water which increases the oxygen content and prevents greasy/dusty films settling on the surface.
It won’t harm them. Vigorous bubbles may create too much movement and stress some newts. This can easily be solved by adding an inexpensive valve to regulate the air flow. http://www.fishandfins.co.uk/images/9709.jpg
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